The old gold is for the clergyman (6)
I believe the answer is:
pastor
'for the clergyman' is the definition.
(pastor is a kind of clergyman)
'the old gold' is the wordplay.
'the old' becomes 'past'.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'past'+'or'='PASTOR'
'is' is the link.
(Other definitions for pastor that I've seen before include "One with a flock (of people)" , "Minister of religion" , "Flock's leader" , "Old shepherd" , "Christian minister" .)