Unemployed daughter in French island (4)
I believe the answer is:
'unemployed' is the definition.
(similar in meaning)
'daughter in french island' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'in' means one lot of letters goes inside another.
'french island' becomes 'ile' ('island' in French).
'd' inserted inside 'ile' is 'IDLE'.
(Other definitions for idle that I've seen before include "Lied about being lazy or not working" , "Member of comedy team" , "Slothful" , "Maybe Eric" , "-- Jack, pantomime character" .)