People entering wrong hell? (7)
I believe the answer is:
torment
'hell?' is the definition.
(thesaurus)
'people entering wrong' is the wordplay.
'people' becomes 'men' (man is a kind of person).
'entering' means one lot of letters goes inside another.
'wrong' becomes 'tort' (legal term).
'men' going within 'tort' is 'TORMENT'.
(Other definitions for torment that I've seen before include "Punish" , "Pester in a cruel way" , "Severe pain" , "Persecute" , "Hound" .)