Food in season before revolution (6,4)
I believe the answer is:
spring roll
'food' is the definition.
(spring roll is a kind of food)
'season before revolution' is the wordplay.
'season' becomes 'spring' (spring is a kind of season**).
'before' is a charade indicator (letters next to each other).
'revolution' becomes 'roll' ('roll' can be a synonym of 'revolution').
'spring'+'roll'='SPRING ROLL'
'in' acts as a link.
(Other definitions for spring roll that I've seen before include "dish from China" , "Portion of Chinese food" , "Chinese pancake" , "Gloucestershire event?" , "Chinese snack" .)