Coffee Break Cryptic

25 June

Across

1 Island that I confused with another island (6)
4 Making a cat sit still (6)
8 Claim a gentleman is hiding a picture (5)
9 Churchill gains weight (7)
10 He swears he's in the cavalry (7)
11 Tree in river not cold at first (5)
12 Come after break for stuffing (9)
17 Possible means of identification? (5)
19 Dash back with German article for part-exchange (5-2)
21 Sibling rivalry's beginning? Worry about it! (7)
22 An animal arrived then left (5)
23 Phrase translated for mountain guide (6)
24 Composer from Harlem (6)

Down

1 Oliver's unforeseen developments (6)
2 Set out to forestall principal on vacation (4,3)
3 Belgian city getting rid of an idiot (5)
5 Metal goods ruined in water (7)
6 Toddler, extremely exhausted, has to be carried (5)
7 Bird seen by wharf in London (6)
9 Wodehouse character heard in city (9)
13 Fruit became more trendy (7)
14 Current sort of underwear? (7)
15 Egyptian god transported in a bus (6)
16 Sportsman showing displeasure when lake is filled in (6)
18 American elk or Scottish rodent? (5)
20 Capital cricket club in the middle of Nicaragua (5)