Mexican mister (5)

I think it could be either:

Which length description are you looking for?:

senor

'mexican mister' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for senor that I've seen before include "Spanish chap" , "European title" , "Title of a Spanish-speaking man" , "Spanish gent of Norse origin" , "'Mister' in Spain" .)

I've seen this clue in the Penny Press, the Newsday and The Wall Street Journal.

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