Old coin for Sun, perhaps (6)
I believe the answer is:
tanner
I believe this clue is a double definition.
'old coin' is the first definition.
(historical sixpence coin)
'sun perhaps' is the second definition.
(the sun tans people)
'for' is the link.
(Other definitions for tanner that I've seen before include "bronzer?" , "Old bit of silver" , "Curer of hides, maker of leather" , "Person who converts hides into leather" , "one getting bronzed?" .)