Prefix with zone or pop (4)

I believe the answer is:

euro

'prefix with zone or pop' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for euro that I've seen before include "Continental currency" , "Major currency" , "jumper" , "Basic monetary unit for 19 countries" , "Currency of Austria" .)

I've seen this clue in the USA Today and The New York Times.

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