Colours (4)
'colours' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hues that I've seen before include "Tones or shades" , "Colours" .)
(Other definitions for red that I've seen before include "Colour for a blusher" , "Colour for danger" , "Colour of communism" , "Inflamed" , "eg Cardinal" .)