Down to last few but think I must have made a few mistakes as can't find any words that make sense to fit!
14A: Concealed in cloud reportedly coming over (5)
P?R?R
17A: Things going over one's head in intelligence - name escaping me? (7)
??A?S?U
23A: A service cut back, as some way off (4)
?F?F
41A: Turnips used to be called parsnips on the borders (5)
N?E?S
50A: Particular manner came across with builder's mate?(6)
?E?A?D
9D: Passing comment?(4,5)
L?S?/??R?S
and finally 20D which has been driving me crazy:
Traveller's disease unknown in men having overeaten, smug after treatment(10,7)
M?N?E?U?A?/R?V?N?E
Is the second word revenge?