Name idiot having gold as capital (6)
I believe the answer is:
nassau
'capital' is the definition.
(Nassau is an example)
'name idiot having gold' is the wordplay.
'name' becomes 'n' (common abbreviation e.g. on forms).
'idiot' becomes 'ass' (I've seen this before**).
'having' is a charade indicator (letters next to each other).
'gold' becomes 'au' (Au is the chemical symbol for gold).
'n'+'ass'+'au'='NASSAU'
'as' is the link.
(Other definitions for nassau that I've seen before include "Bahamian capital" , "Capital of the Bahamas" , "Caribbean resort" , "Port of the Bahamas" , "Saunas (anag)" .)