Set up wrong sort of socialist (4)
I believe the answer is:
trot
'sort of socialist' is the definition.
'trot' can be an answer for 'socialist' (I've seen this before). I am unsure of the 'sort of' bit.
'set up wrong' is the wordplay.
'set up' says the letters should be written backwards.
'wrong' becomes 'tort' (legal term).
'tort' reversed gives 'TROT'.
Can you help me to learn more?
(Other definitions for trot that I've seen before include "(Horse's) pace faster than a walk" , "moderate movement" , "Move like a horse" , "Militant socialist (informal)" , "A slowish run, perhaps by horse" .)