Scientist found in a revolutionary fog? (7)
I believe the answer is:
chemist
'scientist' is the definition.
(I know that chemist is a type of scientist)
'a revolutionary fog?' is the wordplay.
'a revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'fog?' becomes 'mist' (mist is a kind of fog).
'che'+'mist'='CHEMIST'
'found in' is the link.
(Other definitions for chemist that I've seen before include "Pharmacist, apothecary" , "Seller of medicines and toiletries" , "Shop selling medicines" , "Faraday, for example" , "Drugstore" .)