Crossword Genius

Big idea (of a speech, say) (7)

Ross

I believe the answer is:

keynote

(Other definitions for keynote that I've seen before include "Central theme" , "Determining principle in a speech" , "Principal theme (eg of a speech)" , "One tyke (anag)" , "Prevailing tone or idea of a speech" .)

I've seen this clue in The Guardian.
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