Pounds carried by Buddhist priest's pack animal (5)
I believe the answer is:
llama
'pack animal' is the definition.
(llamas are often used as pack animals)
'pounds carried by buddhist priest's' is the wordplay.
'pounds' becomes 'L' (abbreviation e.g. Lsd - pounds, shillings, pence).
'carried by' is an insertion indicator.
'buddhist priest' becomes 'lama' (as in the Dalai Lama).
'l' inserted within 'lama' is 'LLAMA'.
(Other definitions for llama that I've seen before include "A mall (anag.)" , "Andean beast of burden" , "20vian beast" , "Domesticated pack animal of the Andes" , "Woolly Andean animal" .)