Italian currency, once (4)
I believe the answer is:
lira
'italian currency once' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lira that I've seen before include "Turkish currency" , "Former unit of money in Italy" , "Unit of money for 26 across" , "old European capital" , "Old unit of Italian money" .)