Relative said to be in French resort (5)
I believe the answer is:
niece
'relative' is the definition.
(type of relative)
'said to be in french resort' is the wordplay.
'said to be' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'french resort' becomes 'Nice' (French coastal resort).
'e' put inside 'nice' is 'NIECE'.
Can you help me to learn more?
(Other definitions for niece that I've seen before include "One of the family" , "Brother's girl" , "Brother's daughter" , "A younger female relative" , "Criminal" .)