Animal left by Tibetan monk (5)
I believe the answer is:
llama
'animal' is the definition.
(I've seen this before)
'left by tibetan monk' is the wordplay.
'left by' becomes 'l' (I've seen this in other clues).
'tibetan monk' becomes 'lama' (I've seen this before).
'l'+'lama'='LLAMA'
(Other definitions for llama that I've seen before include "Pack animal, native to the Andes" , "Alpaca" , "Peruvian camel" , "Fleecy mammal" , "South American transport system" .)