Hatching a plot? Fascinating! (10)

I believe the answer is:

intriguing

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'fascinating' is the definition.
('intrigue' can be a synonym of 'fascinate')

I can't explain the rest of the clue.

(Other definitions for intriguing that I've seen before include "What conspirators are up to" , "Conspiring; fascinating" .)

I've seen this clue in The Times.

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