1: Arcking shot from Bill O'Brien (3)
2: Small United Nations state (South Korea) getting excellent, if abbreviated, kind of exposure (9)
3: Policeman extremely sensitive about opportunity (5)
4: Watering devices found in run-down orange sheds (6, 5)
6: Chain some; cuff objectors (3)
7: Hovel revamp ending depression (5)
8: Pick up line for first man swinging both ways? (5,2,4)
11: Conducted fight in tent, it's clear (11)
12: Drunkard turns up near beach, reversing new habit, to sleep fitfully (4,3,4)
13: Managed in lower Antwerp (3)
17: Do people in the medical speciality consider law? (9)
19: Mann's 'Death in Venice' Dorothy sent up (3)
22: The lowest point in a dire section (5)
24: Come round again about dog (5)
26: Bloody bored inside (3)
27: Send back gangster's gun to get ID (3)
28: Pronounced ability to smell negative votes (3)