Foreign money you no longer earn, finally (3)
I believe the answer is:
yen
'foreign money' is the definition.
(Japanese currency)
'you no longer earn finally' is the wordplay.
'you no longer' becomes 'ye' (archaic version of 'you').
'finally' indicates one should take the final letters.
The last letter of 'earn' is 'n'.
'ye'+'n'='YEN'
(Other definitions for yen that I've seen before include "Intense desire for a Japanese coin" , "foreign currency" , "Currency of Japan" , "money in Tokyo" , "Itch, desire" .)