A revolutionary socialist restricts fair person who'd make small changes (8)
I believe the answer is:
adjuster
'person who'd make small changes' is the definition.
I can't judge whether this defines the answer.
'a revolutionary socialist restricts fair' is the wordplay.
'revolutionary' shows that the letters should be reversed in order (letters revolve around).
'socialist' becomes 'red' (socialism is often associated with the colour red).
'restricts' indicates putting letters inside.
'fair' becomes 'just' (Synonym).
'red' in reverse letter order is 'der'.
'der' placed around 'just' is 'djuster'.
'a'+'djuster'='ADJUSTER'
Can you help me to learn more?
(Other definitions for adjuster that I've seen before include "Regulator" , "One tweaks" , "One makes tiny reforms" , "One slightly altering" , "I'll change" .)