Auric's aged after golf (4)
I believe the answer is:
gold
'auric's' is the definition.
(thesaurus)
'aged after golf' is the wordplay.
'aged' becomes 'old' (similar in meaning).
'after' means one lot of letters go next to another.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'old' put after 'g' is 'GOLD'.
(Other definitions for gold that I've seen before include "Wealth; first prize" , "One of the Magi's gifts" , "Thin sheet of precious metal" , "Woman after a man's money" , "Tokens of marriage" .)