1 Cunningly mediate our instrument used to measure hearing sensitivity (10)
2 Spy a tangled hair on carpet (4,4)
3 Powerful abrasive tool partly smooths and eradicates (6)
4 Greek characters to fully satisfy in retrospect (4)
5 Twisted conspirator lacking subtle art; venomous creature (8)
6 Mum is backing period of fasting (6)
7 Crude nationalist producing further crop (4)
13 In Lanark sneak about small secluded retreat (5)
15 Sailor's masculine identity; southern switched-on fellow (10)
17 Unconcerned, having no vehicle, we hear, going round Europe. (8)
18 Showing the way in grand university intake's first hop (8)
20 Mindlessly repeat Press Association republican rubbish (6)
22 Incessant talk in Holyrood of unstable treaty (6)
24 Zest when turning up to plaster with cow dung (4)
25 Piece of sacrilege to irritate someone (4)