People in wrongful act, suffering (7)
I believe the answer is:
torment
'suffering' is the definition.
(I know that torment is a type of suffering)
'people in wrongful act' is the wordplay.
'people' becomes 'men' (men are people).
'in' indicates putting letters inside.
'wrongful act' becomes 'tort' (legal term).
'men' put into 'tort' is 'TORMENT'.
(Other definitions for torment that I've seen before include "Tease unkindly" , "Pester in a cruel way" , "Punish" , "Pester annoyingly" , "Badger" .)