Mourn the French way? (3)
I believe the answer is:
rue
I believe this clue is a double definition.
'mourn' is the first definition.
(thesaurus)
'the french way?' is the second definition.
(I've seen this before)
(Other definitions for rue that I've seen before include "Feel bad" , "Bitterly regret - plant" , "show you're sorry!" , "Fish eggs" , "Wish not to have been" .)