Old money of Portugal (6)
I believe the answer is:
escudo
'old money of portugal' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for escudo that I've seen before include "Old Portuguese currency" , "Former Portuguese coin" , "Old US code in Portugal, oddly" , "Smash in C Verde" , "coin in use before the euro" .)