Innocent, the Parisian in jail (5)
I believe the answer is:
clean
'innocent' is the definition.
(thesaurus)
'the parisian in jail' is the wordplay.
'the parisian' becomes 'le' (definite article in French).
'in' indicates putting letters inside.
'jail' becomes 'can' (the can is American slang for prison).
'le' inserted inside 'can' is 'CLEAN'.
(Other definitions for clean that I've seen before include "Devoid of dirt" , "Innocent" , "Remove dirt or stain" , "Untarnished" , "Complete" .)