Support end to violence in pub (4)
I believe the answer is:
bear
'support' is the definition.
(thesaurus)
'end to violence in pub' is the wordplay.
'end to' suggests the final letters.
'in' indicates putting letters inside.
'pub' becomes 'bar' (I've seen this before).
The final letter of 'violence' is 'e'.
'e' going within 'bar' is 'BEAR'.
(Other definitions for bear that I've seen before include "rude fellow" , "Paddington, Rupert" , "One's hairy" , "Tolerate; animal" , "Give birth to - large mammal" .)