Stop people creating hell (9)
I believe the answer is:
damnation
'hell' is the definition.
(I've seen this before)
'stop people' is the wordplay.
'stop' becomes 'dam' (I've seen this in other clues).
'people' becomes 'nation'.
'dam'+'nation'='DAMNATION'
'creating' acts as a link.
(Other definitions for damnation that I've seen before include "Infernal punishment" , "27 [HELL]" , "Curse" , "angry exclamation?" , "Eternal punishment" .)