14a) Morris dancing in huge trouble? That's vexing (9) ??R???O??
14d) Lexicographer employs mother as site manager (9) ??R??????
16d) Former MP to do the opposite of 15 (5) no letters, have not done 15?
18d) Midlands uni, taking in new 500, took servile attitude (7) no letters
19a) Haunch of venison put up (11) ??N????????
All help greatly appreciated.