Formal proposition after the end of the conference produces mental agitation (7)

I believe the answer is:

emotion

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'mental agitation' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for emotion that I've seen before include "Feeling like love or fear" , "Feeling - sentiment" , "Agitation of mind" , "Fear possibly" , "Surprise, perhaps" .)

I've seen this clue in The Irish Independent.

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