1: Chip is describing rare bird call (5)
2: Flower, large one, set up outside (5)
3: Polygraph unexpectedly traps vandal (3)
4: Examiner for each drug addict (7)
5: Run over Martian explorer (5)
6: Upset top duo; I went and confessed (5,2,2,2)
9: Best work it out with mother (7)
11: Incomplete raw data lies in largely unexplored regions (4,7)
13: Batters consisting of partially digested food and semi-solids (7)
14: Paradise, perhaps, where rails hang askew (7-2)
18: Leaders of trendy American politicians, in old collars, apply starch (7)
20: Oriental talc dispenser deserves acclaim (5)
22: German painter in a southern state (5)
23: Gutter seamstress (5)
25: Emergency room stocks one sensitive organ (3)