A revolutionary agent here (3)
I believe the answer is:
rep
'agent here' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'a revolutionary' is the wordplay.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'revolutionary' says the letters should be written in reverse (letters revolve around).
'per' reversed gives 'REP'.
Can you help me to learn more?
(Other definitions for rep that I've seen before include "Theatre; fabric; salesman" , "Corded cloth for short theatrical group" , "Corded fabric" , "Travelling salesman" , "what a draper usually sells" .)