Church warden consumed by The Greens -- those presumably bringing two opposing Parties together

'those presumably bringing two opposing parties together' is the definition.
I know nothing about this answer so I can't judge whether this works.

'church warden consumed by the greens' is the wordplay.
I cannot really understand how this works, but
'church' could be 'ce' (abbreviation for Church of England) and 'ce' is present in the answer.
'by' could be 'per' and 'per' is located in the answer.
'greens' could be 'pea' (pea green is a kind of green) and 'pea' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?