French resort overwhelming English family member (5)
I believe the answer is:
niece
'family member' is the definition.
(I've seen this before)
'french resort overwhelming english' is the wordplay.
'french resort' becomes 'nice' (French coastal resort).
'overwhelming' means one lot of letters goes inside another.
'english' becomes 'E' (abbreviation).
'nice' enclosing 'e' is 'NIECE'.
(Other definitions for niece that I've seen before include "Female family member" , "Preparation for curdling milk" , "Brother or sister's daughter" , "[PRIEST'S] daughter?" , "A younger female relative" .)