Former gold coin (6)
'former gold coin' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ducat that I've seen before include "tender once" , "Coin once used" , "Antique coin" , "Former European gold coin" , "Historical coin" .)
'former gold coin' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for guinea that I've seen before include "Obsolete gold coin" , "105p in old money" , "State" , "one pound and five pence" , "Sum of PS1.05" .)