Writers one gets on with at the boarding house (7)
I believe the answer is:
pension
'the boarding house' is the definition.
(I've seen this before)
'writers one gets on' is the wordplay.
'writers' becomes 'pens' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'gets' means one lot of letters go next to another.
'pens'+'i'+'on'='PENSION'
'with at' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for pension that I've seen before include "support for the elderly" , "Retired person's allowance" , "residence abroad" , "what oldies may have earned" , "Regular payment for retired persons" .)