Supposed snobs mixed with elite (10)
I believe the answer is:
ostensible
'supposed' is the definition.
(I've seen this before)
'snobs mixed with elite' is the wordplay.
'mixed with' indicates an anagram.
'snobs' with its letters anagrammed with 'elite' makes 'OSTENSIBLE'.
(Other definitions for ostensible that I've seen before include "Apparently true" , "Apparent" , "Manifest" , "Supposed" , "Professed" .)