Superior nosh must be demolished with bibs (8)
I believe the answer is:
snobbish
'superior' is the definition.
(thesaurus)
'nosh must be demolished with bibs' is the wordplay.
'must be demolished with' indicates an anagram.
'nosh' anagrammed with 'bibs' can make 'SNOBBISH'.
(Other definitions for snobbish that I've seen before include "stuck up" , "Uppity, considering oneself socially superior" , "Stuck-up" , "Considering oneself socially superior to others" , "Condescending to inferiors" .)