Europe possibly missing old currency (5)
I believe the answer is:
rupee
'currency' is the definition.
(eg currency of India)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for rupee that I've seen before include "Indian bread" , "India's currency" , "Currency of India, Pakistan and Bhutan" , "Indian rhino" , "Currency of the subcontinent" .)