Whim or fancy (6)

I believe the answer is:

notion

I believe this clue is a double definition.

'whim' is the first definition.
(synonyms)

'fancy' is the second definition.
(thesaurus)

(Other definitions for notion that I've seen before include "Idea or fancy" , "clue" , "An idea or casual thought" , "Idea or whim" , "Whim or fancy" .)

I've seen this clue in The Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.