Hi SmellyHarry,
31A is a variation of the French word for woman, but with only one M, which is a legal term for a woman. 29D, think "Put your dukes up!"
You'll find a common letter in those two answers to enter into the 2nd cell for each.
4419 - depending upon how lucky you are with solving the clues where the unused letters give you assistance on the two-word description, you might need to do quite a bit of cold-solving. But I'd say that the clues aren't as difficult as last week...stick with it, pal