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 new that I've seen before include "Not previously used" , "Contemporary" , "Modern" , "Fresh, unused" , "'Fresh, novel (3)'" .)