It may have been spent in Argentina (4)

I believe the answer is:

peso

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'it may have been spent in argentina' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for peso that I've seen before include "Mexican coin" , "Chilean currency" , "ready for Mexican" , "Currency of Mexico" , "Mexican monetary unit" .)

I've seen this clue in the Evening Standard.

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