Fanciful notion (6)

I believe the answer is:

whimsy

(Other definitions for whimsy that I've seen before include "Fanciful ideas" , "Fanciful thoughts" , "Capricious idea - sounds like Sayers' sleuth" , "Fancy; notion" , "Capricious humour" .)

I've seen this clue in the Sydney Morning Herald and The Guardian.

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