Trial for gold trade? (6)
I believe the answer is:
ordeal
'trial' is the definition.
(I've seen this before)
'gold trade?' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'trade?' becomes 'deal' ('deal' can be a synonym of 'trade').
'or'+'deal'='ORDEAL'
'for' acts as a link.
(Other definitions for ordeal that I've seen before include "Horrific experience" , "Difficult experience, a tough time" , "Prolonged distressing experience" , "severe test shows" , "Severe or trying experience" .)