Coffee Break Cryptic

7 December

Across

1 Southern Iceland? (10)
7 Do find West Country river charming (7)
8 Girl involved in Indian nationalism (4)
10 I turned to a letter from Greece (4)
11 Austrian vine seen to need cultivation (8)
13 People from Zagreb, perhaps, overthrowing Castro (6)
15 Amusing type could be derisive when crossing street (6)
17 Use paint to represent flowers (8)
18 Dreadful rage after the first of December (4)
21 A goddess from another age (4)
22 Like one of three needing holiday permit? (7)
23 First prizes making models glad (4,6)

Down

1 Get involved with an intermediary (5)
2 So the bus is empty? (4)
3 Check it again and plant it (2-4)
4 Apprentices scatter as I enter (8)
5 Study before exam or competition (7)
6 Undersea overseer? (9)
9 Girl transplanting a thin tree (9)
12 Normal flag (8)
14 He got on badly, being very active (2,3,2)
16 What a snake may do that amuses a baby (6)
19 Is little Leslie seen in the Hebrides, for example? (5)
20 I'm in Los Angeles, an American city (4)