Scarlet, say (3)
I believe the answer is:
red
'scarlet say' is the definition.
(scarlet is a kind of red)
This is all the clue.
(Other definitions for red that I've seen before include "River, its source in the US, flowing north to empty into L Winnipeg" , "Colour of Merlot wine" , "- Cross; - admiral" , "Florid" , "Type of wine" .)