Coffee Break Cryptic

4 June

Across

1 Herd heard in port (5)
4 Award kept in De Niro's caravan? (5)
7 A party leader has little desire for food (8)
8 Panto character made to change (4)
9 A bird engaged in some activity (2,2)
10 Leader in dance is wrong to twist (7)
12 Urge able guy to give up sport? (5,6)
14 Traitor's initial motive for his crime (7)
16 Support for piano? (4)
19 Lincoln seen by daughter possibly sleeping (4)
20 English attribute that makes no difference (8)
21 Partly capturing Italian city (5)
22 US lawyer entertained by plaything now (5)

Down

1 Drink caught up with old man (5)
2 Crying as a result of little noise? (7)
3 Hide capital for Swiss family (4)
4 Joke about English passenger ship (3-5)
5 A trainee soldier acted strangely (5)
6 Self-reproach about TV detective (7)
11 Austrian dressed ornately (8)
12 Uncommon morsel for a snack? (7)
13 Mixed-up clothing came first (7)
15 Does it count as a poisonous reptile? (5)
17 Trifling - like a naval officer? (5)
18 Only time for cask (4)