Send poor aunt to accommodate Liberal candidate (9)
I believe the answer is:
postulant
'candidate' is the definition.
(thesaurus)
'send poor aunt to accommodate liberal' is the wordplay.
'send' becomes 'post' ('post' can be a synonym of 'send'**).
'poor' indicates an anagram.
'to accommodate' means one lot of letters goes inside another.
'liberal' becomes 'l' (abbreviation).
'aunt' is an anagram of 'uant'.
'uant' enclosing 'l' is 'ulant'.
'post'+'ulant'='POSTULANT'
(Other definitions for postulant that I've seen before include "candidate" , "One seeking admission into a religious order" .)