Official accustomed to being denied (7)
I believe the answer is:
refused
'being denied' is the definition.
(thesaurus)
'official accustomed' is the wordplay.
'official' becomes 'ref' (match official in football, say).
'accustomed' becomes 'used' (I've seen this before).
'ref'+'used'='REFUSED'
'to' acts as a link.
(Other definitions for refused that I've seen before include "Was unwilling to accept" , "Declined, rejected" , "Not accepted" , "turned down appeal" , "Said no (7)" .)