Border river (3,6)

I believe the answer is:

rio grande

'border river' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for rio grande that I've seen before include "Great river bordering USA and Mexico" , "running water" , "River boundary between the US and Mexico" , "Long river" , "Colorado-to-Mexico river" .)

I've seen this clue in the Thinks.com and The Telegraph.

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