Chore mixing yellowish colour (5)
I believe the answer is:
ochre
'yellowish colour' is the definition.
(I've seen this in another clue)
'chore mixing' is the wordplay.
'mixing' is an anagram indicator.
'chore' anagrammed gives 'OCHRE'.
(Other definitions for ochre that I've seen before include "natural colouring" , "Yellow-orange colour" , "Chore using pale brownish colour (5)" , "Yellow/brown pigment" , "Earth-coloured pigment" .)