Allowance for boarding-house (7)
I believe the answer is:
pension
'allowance' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for pension that I've seen before include "Payment to traitor" , "Nice little hotel" , "Retiree's income" , "Retirement pay in a Continental boarding-house" , "Income in retirement" .)