Track gold coin? (5)
I believe the answer is:
orbit
'track' is the definition.
(I've seen this before)
'gold coin?' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'coin?' becomes 'bit' (I've seen this before).
'or'+'bit'='ORBIT'
(Other definitions for orbit that I've seen before include "Planet's track" , "Particular environment" , "astronauts' course" , "Stellar path" , "Go round" .)