Metallic money (6)
I believe the answer is:
specie
'metallic money' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for specie that I've seen before include "Coins collectively" , "Money as coins" , "Coin as opposed to paper money" , "Money in the form of coin" , "Broken pieces for coined money" .)