1: Failure to remember Bach work (5)
4: Offering advice, King takes over one bit, zany initially (9)
9: It isnt good for a man whos batting to get a hundred in the game (9)
10: Mousy girlfriend loses head and bellybutton (5)
11: Servile son, first prodigal (7)
12: Herb gets into place for icy dessert (7)
13: Ambush late-rising with auditors load (3,2,4)
14: The time before the first woman (3)
15: Lifeblood of dope (3)
17: Its very like a mess; rebel appears at fault (9)
21: Dilapidated city slum without question a source of sectariansim. (7)
23: Name of girl training otter in Los Angeles (7)
24: It may be used in candy or brought back in taxi (5)
25: They say the headmaster should be guided by this (9)
26: Heels were repaired in another place (9)
27: 'Log-in failed', in technical terms (5)