Journalist provided with diamonds in town hall perhaps (7)
I believe the answer is:
edifice
'town hall perhaps' is the definition.
(town hall is a kind of edifice)
'journalist provided with diamonds' is the wordplay.
'journalist' becomes 'ed' (short for editor).
'provided' becomes 'if'.
'with' is a charade indicator (letters next to each other).
'diamonds' becomes 'ice' (I've seen this before).
'ed'+'if'+'ice'='EDIFICE'
'in' acts as a link.
(Other definitions for edifice that I've seen before include "Permanent building" , "Monument" , "Large structure" , "'Large, imposing building (7)'" , "Grand building" .)