Mandarin orange centre shown in Sir Clive TV broadcast (5,7)
I believe the answer is:
civil servant
'mandarin' is the definition.
(thesaurus)
'orange centre shown in sir clive tv broadcast' is the wordplay.
'centre' indicates the central letters.
'shown in' is an insertion indicator.
'broadcast' indicates an anagram (letters scattered or cast around).
The centre of 'orange' is 'an'.
'sir'+'clive'+'tv'='sirclivetv'
'sirclivetv' is an anagram of 'civilservt'.
'an' going within 'civilservt' is 'CIVIL SERVANT'.
(Other definitions for civil servant that I've seen before include "Government employee" , "Person working in the public sector" , "Government official" .)