1 Establishment of song from Bartok: The Healer, perhaps (10,5)
2 Crap post office circular (3)
3 Willow’s blooming more with top clipped (5)
4 Clergyman embracing a source of power (7)
5 Idly play tango with violin, not loudly (7)
6 Puzzle a Parisian caught in trick snare? (9)
7 Titan’s finally cut short (5)
8 Single state pension? (5,10)
12 Director Besson starts to ape Spielberg (5)
15 Damaging museum, new driver is mortified at first (9)
17 There are lies, damned lies, and shortly these tests that take time (5)
19 Fertilizer expense taken on by old member (7)
20 Canter about getting uniform for fabulous horseman (7)
22 Building style from Channel Islands no-one brought up (5)
24 Fast cars (5)
27 Harrison, a bit overexposed (3)