Kind of French coin! (6)
I believe the answer is:
decent
'kind' is the definition.
(I've seen this before)
'of french coin' is the wordplay.
'of french' becomes 'de' ('of' in French).
'coin' becomes 'cent' (cent is a kind of coin).
'de'+'cent'='DECENT'
(Other definitions for decent that I've seen before include "Moral, respectable" , "Presentable" , "Appropriate, fitting" , "Winner" , "Polite - fitting" .)