Chocolatier dismisses other whitish type of material (6)

I believe the answer is:

calico

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'material' is the definition.
(calico is a kind of material)

I don't understand the remainder of the clue.

(Other definitions for calico that I've seen before include "Plain cotton cloth, white or unbleached" , "White cotton fabric" , "Coarse cloth with a bright print" , "Given material for dress" , "Coarse printed cotton cloth" .)

I've seen this clue in the Irish Times.

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