Time to relax on the French island? Certainly! (7)
I believe the answer is:
leisure
'time to relax' is the definition.
(I've seen this in another clue)
'on the french island? certainly' is the wordplay.
'on' means one lot of letters go next to another.
'the french' becomes 'le' ('the' in French).
'island?' becomes 'i' (geographical abbreviation).
'certainly' becomes 'sure' (synonyms).
'le' put next to 'i' is 'lei'.
'lei'+'sure'='LEISURE'
(Other definitions for leisure that I've seen before include "Time for relaxing" , "Time away from work" , "Use lire (anag)" , "Ease; time off work" , "Breathing space" .)