Use milk mostly in mixing cereal (6)

I believe the answer is:

muesli

(Other definitions for muesli that I've seen before include "Oat-based breakfast cereal" , "Cereal made with oats and nuts" , "Mule is fed with breakfast compound" , "Breakfast food of cereals, dried fruit, nuts etc" , "Breakfast food of cereals, fruits, nuts etc" .)

I've seen this clue in The Sun.

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