Spitting pack animal (5)
I believe the answer is:
llama
'spitting pack animal' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for llama that I've seen before include "As bearer of burdens" , "Camel-like animal" , "Peruvian beast of burden" , "one to chew the cud" , "wool supplier" .)