Arizona county or river (4)

I believe the answer is:

gila

I believe this is a double definition.

'arizona county' is the first definition.
(I've seen this in another clue)

'river' is the second definition.
(Gila River is an example)

(Other definitions for gila that I've seen before include "lizard always - this one's venomous" , "Beast" .)

I've seen this clue in the LA Times.

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