Anne is about to produce a pigment (6)
I believe the answer is:
sienna
'a pigment' is the definition.
(sienna is a kind of pigment)
'anne is about' is the wordplay.
'about' says the letters should be written backwards.
'anne'+'is'='anneis'
'anneis' in reverse letter order is '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" .)