Nikkei 225 currency (3)
I believe the answer is:
yen
'nikkei 225 currency' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yen that I've seen before include "Longing, hankering after" , "Japanese currency; yearning" , "Long for Japanese money?" , "Intense longing" , "Itch, craving" .)