Characters within decide against proposal (4)

I believe the answer is:

idea

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

'characters within decide against' is the wordplay.
'characters' says the answer is hidden in the clue (some letters or characters from the clue).
'IDEA' can be found hidden inside 'within decide against'.

(Other definitions for idea that I've seen before include "Suggestion" , "Intention" , "Thought, belief" , "A suspicion of" , "intellectual product" .)

I've seen this clue in The Sun.

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