Brown, say (6)
I believe the answer is:
colour
'brown say' is the definition.
(brown is a kind of colour)
This is the entire clue.
(Other definitions for colour that I've seen before include "Blue or green, say" , "Tinge - distort" , "'Tinge, hue (6)'" , "Quality that results from light reflection" , "Red or green, say" .)