Figure on coin (fifty pence piece) (4)
I believe the answer is:
type
'figure' is the definition.
(thesaurus)
'coin fifty pence piece' is the wordplay.
'piece' indicates the answer is hidden within the clue.
'TYPE' can be found hidden inside 'coin fifty pence'.
'on' is the link.
(Other definitions for type that I've seen before include "Kind - kind of writing" , "Class, kind or category" , "Kind; set in print" , "Sort, classification" , "The face" .)