Gold accessory, so to speak (6)
I believe the answer is:
orally
'so to speak' is the definition.
Both the answer and definition are adverbs. Perhaps you can see a link between them that I don't see?
'gold accessory' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'accessory' becomes 'ally' (I can't explain this - if you can you should believe this answer much more).
'or'+'ally'='ORALLY'
Can you help me to learn more?
(Other definitions for orally that I've seen before include "How one speaks" , "as auditions are done" , "By (word of) mouth" , "given drugs thus?" , "given by mouth" .)