Pole of German gold sent back (3)
I believe the answer is:
rod
'pole' is the definition.
(synonyms)
'german gold sent back' is the wordplay.
'german' becomes 'd' (abbreviation for Deutschland ie Germany).
'gold' becomes 'or' ('or' is the heraldic name for gold).
'sent back' is a reversal indicator.
'd'+'or'='dor'
'dor' back-to-front is 'ROD'.
'of' is the link.
(Other definitions for rod that I've seen before include "Stick; angler" , "See 13" , "that most anglers use" , "Imperial measure" , "Little boy" .)