Return to deposit gold sovereign (5)
I believe the answer is:
royal
'sovereign' is the definition.
(I've seen this before)
'return to deposit gold' is the wordplay.
'return' is a reversal indicator.
'to deposit' becomes 'lay' (I've seen this before).
'gold' becomes 'or' ('or' is the heraldic name for gold).
'lay'+'or'='layor'
'layor' in reverse letter order is 'ROYAL'.
(Other definitions for royal that I've seen before include "Of queens, say" , "Magnificent" , "Imperial" , "- - Shakespeare Company (RSC)" , "Befitting a monarch" .)