Superior sort (4)
'superior sort' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for snob that I've seen before include "Person who considers himself socially superior" , "One has pretensions" , "One despising inferiors" , "blackleg" , "High-minded type" .)
(Other definitions for abbot that I've seen before include "Head of a religious community" , "Father" , "Monastic superior" , "Head of monastery" , "Monastery chief" .)