Rain forest ruminant (5)
I believe the answer is:
okapi
'rain forest ruminant' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for okapi that I've seen before include "Ruminant related to the giraffe" , "Native of Central Africa" , "rainforest ruminant" , "Wild animal" , "Giraffe-like animal with stripes" .)