Earth hue (5)
I believe the answer is:
ochre
'earth hue' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ochre that I've seen before include "natural colouring" , "What gives a yellow colour" , "Earthy pigment - light brownish-yellow" , "Yellow-orange colour" , "Pigment made from clay and iron oxide" .)