Crossword Genius

Intend to include numbers from Guadalajara, say (7)

Ross

I believe the answer is:

mexican

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'say' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

I don't understand how the remainder of the clue works.

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(Other definitions for mexican that I've seen before include "A central American" , "From Guadalajara or Acapulco?" , "From Chihuahua, perhaps" , "Latin" .)

I've seen this clue in the Evening Standard.
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