1: Gymnast produces hybrid of car and boat (7)
2: Palestinian group participating in way out feat (7)
3: Its a firm, small lettuce (3)
4: Douglas, initially tough, is knocked out (7)
5: Mobster at heart, presently I'll be carrying expensive pistol on hip (7)
6: 27-across about starting off 1-down world unconditionally (2,3,2,4)
7: Again send out note describing Susie misbehaving (7)
8: One American tree growing wild that's very plain (7)
11: Quite put out, doctor axes red tape (11)
15: Insignificant trial includes six from old Rome (7)
16: Arena performer's damage involving time and trouble (7)
18: Look! Car wrecked propeller holder (7)
19: Fully equipped to follow it around (2,5)
20: Film star nuts about sheep (3,4)
21: King of the sun and new moon (7)
24: Consumed and digested tea (3)