The Parisian is on river for relaxation (7)
I believe the answer is:
leisure
'relaxation' is the definition.
(leisure is a kind of relaxation)
'the parisian is on river' is the wordplay.
'the parisian' becomes 'le' (definite article in French).
'on' is a charade indicator (letters next to each other).
'river' becomes 'ure' (I have seen 'River of Wensleydale ' mean 'ure' so perhaps 'river' could also mean 'ure').
'le'+'is'+'ure'='LEISURE'
'for' is the link.
(Other definitions for leisure that I've seen before include "Rest, relaxation" , "casual wear" , "Time to rest and enjoy" , "Free time, comfort and convenience" , "Convenient opportunity" .)