Dispenser of revolutionary spray? (7)
I believe the answer is:
chemist
'dispenser' is the definition.
(I've seen this before)
'revolutionary spray?' is the wordplay.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'spray?' becomes 'mist' (misting is a kind of spraying).
'che'+'mist'='CHEMIST'
'of' acts as a link.
(Other definitions for chemist that I've seen before include "Shop selling medicines" , "Drug store" , "drug dealer" , "Seller of medicines and toiletries" , "Drugstore" .)