Non-ministerial support new church receives to remain unchanged (9)
I believe the answer is:
backbench
'non-ministerial support new church receives to remain unchanged' is the definition.
I can't judge whether this defines the answer.
'non-ministerial support new church receives to remain' is the wordplay.
'non ministerial support' becomes 'back' (I can't justify this - if you can you should give a lot more credence to this answer).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'church' becomes 'ch' (abbreviation on maps etc).
'receives' means one lot of letters goes inside another (inserted letters are received).
'to remain' becomes 'be' (eg be patient, remain patient).
'back'+'n'+'ch'='backnch'
'backnch' placed around 'be' is 'BACKBENCH'.
Can you help me to learn more?
(Other definitions for backbench that I've seen before include "no place for minister" , "Like MP, but not minister" , "(Of MP) not holding office" .)