Amount you get for a quarter of a cent in foreign money (5)
I believe the answer is:
litre
'amount' is the definition.
(litre is a kind of amount)
'a quarter of a cent in foreign money' is the wordplay.
'a quarter of a cent' becomes 't' (one of the four letters in 'cent').
'in' is an insertion indicator.
'foreign money' becomes 'lire' (Italian currency 1861-2002).
't' inserted inside 'lire' is 'LITRE'.
'you get for' is the link.
(Other definitions for litre that I've seen before include "quantity of drink" , "less than two pints" , "Unit of liquid measure" , "One thousand cubic centimetres" , "Fluid measure" .)