Payment when one's finished work in boarding house (7)
I believe the answer is:
pension
'boarding house' is the definition.
(I've seen this before)
'payment when one's finished work' is the wordplay.
I cannot quite see how this works, but
'when' could be 'on' (I've seen this in other clues) and 'on' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
The remaining letters 'pens' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'in' acts as a link.
(Other definitions for pension that I've seen before include "Payment to retired persons a continental boarding house" , "support for the elderly" , "Regular payment for retired persons" , "Income in retirement" , "Retirement pay in a Continental boarding-house" .)