Crossword Genius

Autumnal color source (6)

Ross

I believe the answer is:

asters

(Other definitions for asters that I've seen before include "A rest's a change from flowers" , "Stares oddly at the flowers" , "Christmas daisies" , "Stares at bright flowers" , "Otherwise known as Michaelmas daisies" .)

I've seen this clue in The Wall Street Journal.
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