Pub to ban chap, a brutish fellow (9)
I believe the answer is:
barbarian
'a brutish fellow' is the definition.
(a barbaric or uncivilised person)
'pub to ban chap' is the wordplay.
'pub' becomes 'bar' (both are drinking establishments).
'to ban' becomes 'bar' (I've seen this in other clues).
'chap' becomes 'Ian' (man's name).
'bar'+'bar'+'ian'='BARBARIAN'
(Other definitions for barbarian that I've seen before include "Brutish type" , "uncivilised man" , "wild fellow" , "outlandish foreigner" , "Uncultured, brutish" .)