Reindeer around ridge, four overlooking edges (7)
I believe the answer is:
caribou
'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" .)