Finally given gold and not ... (3)
I believe the answer is:
nor
'and not' is the definition.
('nor' means 'and also not')
'finally given gold' is the wordplay.
'finally' suggests the final letters.
'gold' becomes 'or' ('or' is the heraldic name for gold).
The last letter of 'given' is 'n'.
'n'+'or'='NOR'
(Other definitions for nor that I've seen before include "And not; Norman (abbr.)" , "Link word" , "Common conjunction, goes with neither" , "Negative conjunction" , "Neither one ... the other" .)