Chance to wear revolutionary dress (6)
I believe the answer is:
'dress' is the definition.
(I know that dress can be written as clothe)
'chance to wear revolutionary' is the wordplay.
'chance' becomes 'lot' (as in drawing by lot).
'to wear' means one lot of letters goes inside another (to wear something is to be covered up by it).
'revolutionary' becomes 'Che' (Che Guevara the Marxist revolutionary).
'lot' inserted into 'che' is 'CLOTHE'.
(Other definitions for clothe that I've seen before include "robe" , "Equip" , "Put garments onto" , "apparel" , "Provide cover for body and limbs" .)