Wrong to retain workers from Harrow (7)
I believe the answer is:
torment
'harrow' is the definition.
(thesaurus)
'wrong to retain workers' is the wordplay.
'wrong' becomes 'tort' (legal term).
'to retain' means one lot of letters goes inside another.
'workers' becomes 'men' (man is a kind of worker).
'tort' going around 'men' is 'TORMENT'.
'from' acts as a link.
(Other definitions for torment that I've seen before include "Great suffering" , "Punish" , "Anguish" , "Agony of mind" , "Inflict pain on - pester" .)