Coffee Break Cryptic

16 December

Across

1 Bird to measure plant (10)
7 Sit on mud awkwardly and get off (8)
8 Press club (4)
9 Dance band leader meets everybody (4)
10 Exaggerate term of imprisonment (7)
12 The loud beat changed quickly (2,3,6)
14 My bases, perhaps, in ambassador's residence (7)
16 A little lower - a little lower than the knee (4)
19 Top tennis player, so we hear, is to step down (4)
20 Film star giving pal a coin (2,6)
21 Pitiful tea bellman prepared (10)

Down

1 Go up and get caught on branch of tree (5)
2 Animal to upset King Arthur's city (7)
3 Burden a person usually carries (4)
4 It's mixed in a pot to drink (8)
5 Making a racket, one is thrown out (5)
6 Painful exclamation suppressed by the French is disreputable (6)
11 The main work of an artist (8)
12 A miser deployed lots of soldiers (6)
13 A grizzly youngster? (4,3)
15 Sporting venue taking an age to erect (5)
17 Criminal fight with swords (5)
18 Observe a defect (4)