Our cab I discover runs over a deer

I believe the answer is:

caribou

I'm a little stuck... Click here to teach me more about this clue!

'deer' is the definition.
(caribou is a kind of deer)

'our cab i discover runs over a' is the wordplay.
'our cab i' can be anagrammed to 'CARIBOU'.
But, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for caribou that I've seen before include "Arctic deer - a Rio cub (anag)" , "Ruminant" , "Wild animal" , "Large North American deer" , "North American Arctic deer" .)

I've seen this clue in The Irish Independent.

Want a hint initially instead of a full solution? Install my app