Sixpence (6)
I believe the answer is:
tanner
'sixpence' is the definition.
(I have seen 'Old sixpence ' mean 'tanner' so perhaps 'sixpence' could also mean 'tanner')
This is all the clue.
(Other definitions for tanner that I've seen before include "Old sixpenny piece" , "One preparing leather" , "person in the solarium" , "Leather worker - old sixpence" , "[PENNIES] ?" .)