Yellowish pigment (5)
I believe the answer is:
ochre
'yellowish pigment' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ochre that I've seen before include "Yellow-orange pigment" , "natural colouring" , "Earth-coloured pigment" , "Yellowish-brown or red pigment" , "Chore (anag) - pale brownish-yellow" .)