Female relative heard in French resort (5)
I believe the answer is:
niece
'female relative' is the definition.
(I've seen this before)
'heard in french resort' is the wordplay.
'heard in' shows a homophone (sound like).
'french resort' becomes 'nice' (French coastal resort).
'nice' is a homophone of 'NIECE'.
(Other definitions for niece that I've seen before include "Family relation" , "A sibling's daughter" , "Son's cousin" , "Kinswoman" , "[PRIEST'S] daughter?" .)