Supposed snob's elite somehow (10)
I believe the answer is:
ostensible
'supposed' is the definition.
(I've seen this before)
'snob's elite somehow' is the wordplay.
'somehow' is an anagram indicator.
'snobs'+'elite'='snobselite'
'snobselite' is an anagram of 'OSTENSIBLE'.
(Other definitions for ostensible that I've seen before include "Seeming" , "Manifest" , "Professed" , "Supposed" , "Apparent" .)