Grand Canyon animal (4)
I believe the answer is:
mule
'grand canyon animal' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mule that I've seen before include "Drug courier; animal" , "Proverbially stubborn beast" , "Slipper - beast of burden" , "Donkey-horse hybrid" , "Proverbially stubborn animal" .)