Green, say (6)
'green say' is the definition.
(green is a colour)
This is all the clue.
(Other definitions for colour that I've seen before include "black?" , "Hue, shade" , "Pigment, paint or dye" , "Tinge - distort" , "See 10" .)
(Other definitions for ill that I've seen before include "Shakespeare: '. . . met by moonlight'" , "Under the weather" , "poor" , "Harmful" , "Unwell, sick" .)
(Other definitions for new that I've seen before include "Not existing before" , "'Fresh, novel (3)'" , "and 28 and 29: The 365th day" , "Modern" , "Unused or novel" .)