Church dissenter leading curtailed Mass - movement co-ordinator? (10)

I believe the answer is:

cerebellum

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'curtailed mass movement co-ordinator?' is the definition.
The definition suggests a singular noun which matches the answer.

'church dissenter leading' is the wordplay.
'church' becomes 'CE' (abbreviation for Church of England).
'dissenter' becomes 'rebel' (rebel is a kind of dissenter).
'leading' becomes 'lum' (I can't explain this - if you can you should believe this answer much more).
'ce'+'rebel'+'lum'='CEREBELLUM'

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(Other definitions for cerebellum that I've seen before include "part of the brain" , "bit of brain" , "motor controller" .)

I've seen this clue in The Independent.

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