Income from a boarding house (7)
I believe the answer is:
pension
I believe this is a double definition.
'income' is the first definition.
(I have seen 'Retired income ' mean 'pension' so perhaps 'income' could also mean 'pension')
'a boarding house' is the second definition.
(I've seen this before)
'from' is the link.
(Other definitions for pension that I've seen before include "Bed and breakfast or small hotel in France" , "Retired person's allowance" , "support for the elderly" , "Retirement allowance" , "Retiree's income" .)