Buddhist priest (4)
'buddhist priest' is the definition.
(as in the Dalai Lama)
This is all the clue.
(Other definitions for lama that I've seen before include "A Buddhist priest in Tibet (4)" , "Dalai . . . ., chief priest and once ruler of Tibet" , "Holy man in Tibet" , "Tibetan high priest" , "devout Buddhist" .)
(Other definitions for bonze that I've seen before include "Buddhist priest in Japan or China" , "Buddhist monk" .)