Perfect coin (4)
I believe the answer is:
mint
I believe this clue is a double definition.
'perfect' is the first definition.
(similar in meaning)
'coin' is the second definition.
(I know that coin can be written as mint)
(Other definitions for mint that I've seen before include "Forge" , "Plant - in perfect condition" , "Large sum of money" , "Flavour of the money-maker?" , "Coin-making place or nice lamb sauce" .)