Crossword Genius

Keynote (5)

Ross

I believe the answer is:

theme

'keynote' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for theme that I've seen before include "tune used in Enigma Variations?" , "Recurring melody" , "Topical item" , "Topic; melody" , "Main idea or topic" .)

I've seen this clue in the Sydney Morning Herald and the New York Times.
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