18a...Perhaps Alpine dance is put-up job(4,5)...??C? P?A?T
27a...Be more insensitive dropping one liberal at no cost(7)...??E?E?S
28a...Chap's consumed by fat returning hero(7)...T?E?E?S
7d....Posh vulgarianturns up without big pill(5)...B?L?S
8d....Stupified,tried to find waterwith rod around river(7)...D?O?S?D