Help, please with the following! Thanks!
ACROSS
4 By the way, black weapon is a valuable curio(9, 2 words): O????????
14 Undertaking in 1A is cut by Harpagon(5): ?I??? ( MISER?)
22 Means to an end suggests food and games(7): TA?????
37 Participated in a demo and fought back(7): RA???E?
DOWN
20 Conurbations having connections with Ivory Coast( 6): ???I?S (CITIES?)
30 Distinction working in time(6): ????U?
30
The mudflats one - 31D - has me stumped.I must be misinterpreting a straightforward part of the clue, unless my 38A answer is wrong. Any hints, please?