Wholesome French article in tin (5)
I believe the answer is:
clean
'wholesome' is the definition.
(thesaurus)
'french article in tin' is the wordplay.
'french article' becomes 'le' (definite article in French).
'in' indicates putting letters inside.
'tin' becomes 'can' (synonyms).
'le' going inside 'can' is 'CLEAN'.
(Other definitions for clean that I've seen before include "Complete" , "Free from dirt; well defined" , "Carrying no illegal drugs" , "Non-polluting" , "not polluted" .)