Squabble during lunch (6)
I believe the answer is:
tiffin
'lunch' is the definition.
(Indian term for a meal)
'squabble during' is the wordplay.
'squabble' becomes 'tiff' (synonyms).
'during' becomes 'in' (e.g. during February means in February).
'tiff'+'in'='TIFFIN'
(Other definitions for tiffin that I've seen before include "Light Indian repast" , "Snack, light meal (dated)" , "Lunch (British Raj)" , "Anglo-Indian lunch" , "Midday meal for members of the British Raj in India" .)