They're often dressed as revolutionary youths (6)
I believe the answer is:
salads
'they're often dressed' is the definition.
The definition suggests an adverb but the answer is not.
'as revolutionary youths' is the wordplay.
'revolutionary' is a reversal indicator (letters revolve around).
'youths' becomes 'lads' (lad means a boy or young man).
'as' back-to-front is 'sa'.
'sa'+'lads'='SALADS'
Can you help me to learn more?
(Other definitions for salads that I've seen before include "Leafy meals" , "Vegetable or fruit mixtures" , "Dishes of usually uncooked vegetables" , "Cold meals based on lettuce and vegetables" , "Food mixtures of lettuce etc." .)