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Reindeer around ridge, four overlooking edges (7)

Ross

I believe the answer is:

caribou

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'reindeer' is the definition.
(caribou is a type of reindeer)

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

Can you help me to learn more?

(Other definitions for caribou that I've seen before include "North American Arctic deer" , "N.American reindeer" , "Arctic beast" , "Wild animal" , "North American reindeer" .)

I've seen this clue in The Telegraph.
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