Crossword Genius

Appetiser containing a mostly whitish flour (9)

Ross

I believe the answer is:

wheatmeal

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'flour' is the definition.
(wheatmeal is a kind of flour)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for wheatmeal that I've seen before include "Bread ingredient" , "Type of flour" .)

I've seen this clue in The Independent.
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