Meat supplier intended scrapping a colouring (7)
I believe the answer is:
pigment
'colouring' is the definition.
(I've seen this before)
'meat supplier intended scrapping a' is the wordplay.
'meat supplier' becomes 'pig' (animal used for meat).
'intended' becomes 'meant' (meaning is a kind of intending).
'scrapping' indicates named letters should be taken away.
'meant' with 'a' taken away is 'ment'.
'pig'+'ment'='PIGMENT'
(Other definitions for pigment that I've seen before include "Colouring material" , "Colouring substance" , "Paint" , "Colouring matter" , "Substance giving colour" .)