Tibetan leader left out of Incan transport (4)
I believe the answer is:
lama
'tibetan leader' is the definition.
(I've seen this in another clue)
'left out of incan transport' is the wordplay.
'left' becomes 'l' (common abbreviation).
'out of' is a deletion indicator ('out of' can mean no longer having).
'incan transport' becomes 'llama' (I've seen this in another clue).
'llama' with 'l' removed is 'LAMA'.
(Other definitions for lama that I've seen before include "A Tibetan Buddhist priest or monk" , "Tibetan high priest" , "A Buddist monk in Tibet" , "Tibetan spiritual leader" , "Holy man in Tibet" .)