Feat unaffected by revolution (4)
I believe the answer is:
deed
'feat' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for deed that I've seen before include "Legal document for transfer of property" , "A conscious action" , "Action - legal document" , "documentary evidence" , "Conscious act" .)