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Across 1 Birthday party? (6) 4 Unenergetic sleepy pie has nervous disorder (8) 9 Royal half-fastened with piece of wood (6) 10 Inane liberal assembly every other year (8) 12 Maharishi's teachings include royal series of lessons (4) 13 Coffee, drunk in Missouri before second half of dance (5) 14 Capital found in Politburo's locale (4) 17 Sexless Swedish export. He/she is on your side (12) 20 Not Uri's role? I regretfully end without solving problem (12) 23 Space for reunion of boozers (4) 24 Nerdy characters (5) 25 Is the french man an example? (4) 28 A Serb spy, in disguise, walks in the vicinity (8) 29 British Rail's Walford area service for babes (6) 30 Easy win for spiv with zero volts (8) 31 Join and remove nine (from something we don't need anyway!) (6)

Down 1 Disorientatedly bit a lion-drink (8) 2 Dressing gown made Abe throb (8) 3 Sounds like one's organ is a piece of piss (4) 5 Musical group who created wall of sound with chords (12) 6 Left one ranger, for example (4) 7 Embraced by backing boys, Sir Paul is fussy and fastidious (6) 8 Cowardly scream "Left out down there!" (6) 11 Eccentric Les' sore IBM PC can be minaturised (12) 15 Advertisement for mineral love (5) 16 Doughnut, given to us by rights (5) 18 Convice not to report insult to Mat and Brett (8) 19 Having balance of payments problem in upper-class female PM (8) 21 Repeatedly manhandle a fruit tree (6) 22 Blood boat (6) 26 Very English to put a black ball in (4) 27 Cut an extra-terrestrial circle (4)