1: Star Trek role, beginning to end, is the pits (5)
2: Main nerve carries most central portion (5)
3: Nothing we have to pay (3)
4: Sex and dope are wrong, it's revealed (7)
5: The shoe fits? Caught in abomination! (7)
6: Girl mostly into turning inside out - it's never ending! (11)
7: Annoying ad for toaster design? (3-2)
8: Little Digger pens sailboat drawing sheets (6,3)
12: Incomplete raw data lies in largely unexplored regions (4,7)
14: See chess piece: king suffering hard loss (9)
15: Fix the oil platform ... (3)
16: 23% of Scandinavians backing leaders (3)
19: Beetles, for example, being produced by modern factions (7)
20: American state accepting Irans revolution in its totality (7)
21: Adjust to initially having little juice (5)
23: Shy away from women's clothing (5)
24: Nature photographer leans out (5)
27: Copy of top ten missing (3)