Study in guesthouse, say, to make a living (5-3-6)
I believe the answer is:
bread-and-butter
'a living' is the definition.
('bread and butter' can be a synonym of 'living')
'study in guesthouse say' is the wordplay.
'study' becomes 'read' (synonyms).
'in' indicates putting letters inside.
'guesthouse' becomes 'bandb' (I can't explain this - if you can you should believe this answer much more).
'say' becomes 'utter' (to utter something is to speak or say it).
'read' put within 'bandb' is 'breadandb'.
'breadandb'+'utter'='BREAD-AND-BUTTER'
'to make' is the link.
Can you help me to learn more?
(Other definitions for bread-and-butter that I've seen before include "Living" , "standard" , "livelihood" , "Materialistic, practical" , "Basic" .)