1: Desired rotten insults (7)
3: Drainage area cleaned around 43% of terrain (9)
4: Heroin's prepared approaching land (7)
5: Birth of Wilder sibling (7)
6: Values of 100 missing from boxes (5)
7: Scandinavian boatmen or sea-faring characters (5)
8: We hear you will record part of a Christmas celebration (4,3)
14: Orders pirate to pass around the hat for every one (3,6)
15: Believer in esoteric powers is joining quasi-religious group in October (9)
16: Look! Car wrecked propeller holder (7)
17: Down under - thoroughly (2,5)
18: More nutty British can promenade by the sea (7)
20: Finally sews more lavish embroidery (7)
22: Squeeze in a pash (5)
23: Row (but not in front) and get mixed up (5)