1: Hungarian composer on CD extra, perhaps, with Norwegian composer (7)
5: Excitedly saw open arms (7)
8: Discounting losing one's sense of humour? (8,3)
10: Heavy metal group X (4)
11: Hesper's fresh fields (7)
12: Discharge from Greek island (7)
13: For Summits, speak out of order (5)
15: The outbursts one hears are hers (7)
17: Sex and dope are wrong, it's revealed (7)
20: Cheyenne Mountain installation produces radon mixture (5)
22: I'm great novel detective (7)
23: Religious assembly fitting in star (7)
25: Fix the oil platform ... (3)
26: Upset top duo; I went and confessed (5,2,2,2)
27: Father's wise migration (7)
28: Certain engines stall less jerkily (7)