Cryptic crossword completed

I finally managed to complete the cryptic crossword in the Saturday Age. I’ve jotted down the solution and my deconstruction of each of the clues; partly to celebrate, but mostly to act as a reference for future attempts at these crosswords.
W1 | E | A2 | T | H3 | E | R4 | P | R5 | O | O6 | F | I7 | N | G8 |
A | N | O | E | E | R | N | E | |||||||
I9 | N | T | R | A | N | S | I | T | C10 | O | C | O | A | |
S | I | R | U | I | H | U | R | |||||||
T11 | E | P | I | D | M12 | A | R | D | I | G | R | A | S | |
A | E | I | E | D | H | |||||||||
M13 | I | S | P | R | I | N | T | A14 | S | S | I15 | S | I | |
A | T | G | A16 | N | F | |||||||||
S17 | P | O | U | T18 | S | S19 | N | A | P20 | S | H | O | T | |
S | I | W21 | Y | I | E | |||||||||
A22 | L | L23 | O | T | M | E | N | T | T24 | H | R | O | B25 | |
C | O | A | I | H | C | I | A | |||||||
R26 | O | W | A | N | R27 | E | I | C | H | S | T | A | G | |
E | E | I | D | N | I | O | E | |||||||
D28 | I | R | E | C | T | O | R | G | E | N | E | R | A | L |
Across
- 1.
- Firepower to hang out with protection from the elements (15)
- 9.
- International strain mutated on the road (2,7)
- 10.
- Hot drink company doubled up first of advertisements (5)
- 11.
- Not very enthusiastic about resolving dispute without us (5)
- 12.
- Put a damper on grid as preparations are made for carnival (5,4)
- 13.
- Broker rips into money-maker for an error of this type (8); see note
- 14.
- Mass is increasingly diminishing Francis’ origins (6)
- 17.
- Holds forth parts to toss up (6)
- 19.
- Quick picture of shop, an oddity in the street (8)
- 22.
- Share everything yours truly slotted between parts of the bible (9)
- 24.
- Tether in the middle and steal pound (5)
- 26.
- Horse tied up outside western tree (5)
- 27.
- Threw out the cigars on German diet (9); see note
- 28.
- Upfront or sweeping leader of the group (8,7)
Down
- 1.
- Said to fritter away the midsection (5)
- 2.
- Italian course in the face of former love (9)
- 3.
- Collector finds it more difficult to collect nothing (7)
- 4.
- Going on to think up content for band (8)
- 5.
- Bow out when at last quitting strife-torn Eritrea (6)
- 6.
- Turning rich sod into showy flowers (7)
- 7.
- Expose oneself to obtain currency, to some extent (5)
- 8.
- Used freight as lever in truck (9)
- 13.
- Mother‘s devoted to those mown down (9)
- 15.
- Beneficiary of interior renovation spreading outside the front of the house (9)
- 16.
- Whatever is acceptable to many thin girls (8)
- 18.
- Jumbo litter, can it double? (7)
- 20.
- Be involved with tingle in one’s leg (5,2)
- 21.
- Creep has emerged from shadowier movements (6); see note
- 23.
- Stoop to take the head from bloom (5)
- 25.
- Bakery item set under half the baps (5)
Notes
- 13a:
- Found this quite confusing; “of this type” also suggests “print”.
- 27a:
- Figured that the solution was an anagram of “the cigars”, but needed to search online to figure out what “German diet” referred to.
- 21d:
- Unsure if “has emerged from” means to remove the letters “h”, “a”, and “s” from “shadowier”.