Boxer's reported range (7)

I believe the answer is:

rockies

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'range' is the definition.
(North American mountain range)

I can't explain the rest of the clue.

(Other definitions for rockies that I've seen before include "N. American mountains" , "Great mountain system in western N America" , "Great mountains in western North America" , "Mountain system in west of USA" , "US mountain range" .)

I've seen this clue in The Times.

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