Mexican money (4)

I think it could be either:

Which length description are you looking for?:

peso

'mexican money' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for peso that I've seen before include "Foreign currency" , "Mexican dollar" , "Unit of Mexican money" , "Currency of Mexico" , "Mexican currency unit" .)

I've seen this clue in The Star Tribune, the Penny Press, the Newsday, the LA Times, the King Feature Syndicate and the Universal.

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