North American reindeer (7)
I believe the answer is:
caribou
'north american reindeer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for caribou that I've seen before include "Reindeer of North America" , "N.American reindeer" , "Arctic deer - a Rio cub (anag)" , "Arctic beast" , "Creature" .)