Revolutionary Communist wears brown, without exception (2,1,3)
I believe the answer is:
to a man
'without exception' is the definition.
(synonyms)
'revolutionary communist wears brown' is the wordplay.
'revolutionary' is a reversal indicator (letters revolve around).
'communist' becomes 'mao' (Mao is an example).
'wears' is an insertion indicator.
'brown' becomes 'tan' (tan is a kind of brown).
'mao' in reverse letter order is 'oam'.
'oam' placed within 'tan' is 'TO A MAN'.
(Other definitions for to a man that I've seen before include "Unopposed" , "All without exception - excluding women?" , "All united-males only?" , "all of us" .)