MPs collectively stop benefit (5)
I believe the answer is:
house
'mps collectively' is the definition.
I can't tell whether this definition defines the answer.
'stop benefit' is the wordplay.
'stop' becomes 'ho' (I can't explain this - if you can you should give a lot more credence to this answer).
'benefit' becomes 'use' (I've seen this before).
'ho'+'use'='HOUSE'
Can you help me to learn more?
(Other definitions for house that I've seen before include "Company; dwelling" , "See 1" , "Residence; legislative meeting-place" , "Abode" , "Royal family" .)