Anne is about to produce a pigment (6)
I believe the answer is:
sienna
'a pigment' is the definition.
(I know that sienna is a type of earth color)
'anne is about' is the wordplay.
'about' shows that the letters should be reversed in order.
'anne'+'is'='anneis'
'anneis' written backwards gives 'SIENNA'.
'to produce' acts as a link.
(Other definitions for sienna that I've seen before include "Raw -; burnt -" , "colouring" , "rusty" , "Brownish-yellow substance used as pigment" , "Brownish-yellow colour" .)