I would abbreviate each proposal (4)

I believe the answer is:

idea

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'proposal' is the definition.
(idea can mean a proposal or suggestion)

'i would abbreviate each' is the wordplay.
'i would' becomes 'I'd'.
'abbreviate each' becomes 'ea' (I can't explain this - if you can you should believe this answer much more).
'id'+'ea'='IDEA'

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(Other definitions for idea that I've seen before include "Thought, belief" , "Thought or notion (4)" , "Purpose" , "intellectual product" , "Sudden inspiration?" .)

I've seen this clue in The Globe and Mail.

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