Boy upset, upset by a master, a spiritual master (5,4)
I believe the answer is:
dalai lama
'a spiritual master' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'boy upset upset by a master' is the wordplay.
'boy' becomes 'Al'.
'upset' says the letters should be written backwards.
'upset' becomes 'dalai' (I can't explain this - if you can you should believe this answer much more).
'by' is a charade indicator (letters next to each other).
'a master' becomes 'MA' (Master of Arts).
'al' backwards is 'la'.
'la' put after 'dalai' is 'dalaila'.
'dalaila'+'ma'='DALAI LAMA'
Can you help me to learn more?
(Other definitions for dalai lama that I've seen before include "Former Tibetan ruler" , "Tibetan religious leader" , "Tibetan Buddhist leader, meaning ocean monk" , "World's Buddhist leader, once ruler of Tibet" , "Titular Tibetan" .)