French resentment I start to calm (6)
I believe the answer is:
gallic
'french' is the definition.
(I've seen this before)
'resentment i start to calm' is the wordplay.
'resentment' becomes 'gall' ('gall' can be a synonym of 'resentment').
'start to' says to take the initial letters.
The first letter of 'calm' is 'c'.
'gall'+'i'+'c'='GALLIC'
(Other definitions for gallic that I've seen before include "Characteristic of the French" , "Typically French or of France" , "Of the French/France" , "Like certain wars" , "Pertaining to France" .)