The yearning for yen? (4)

I believe the answer is:

wish

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'yen?' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for wish that I've seen before include "Want (to do something)" , "whim" , "bid" , "Something desired" , "Request - yen" .)

I've seen this clue in the Evening Standard.

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