Crossword Genius

Order mixer only to be added? (6)

Ross

I believe the answer is:

notice

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'order' is the definition.
(thesaurus)

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

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(Other definitions for notice that I've seen before include "Take cognisance of, observe" , "Sign posted in a public place" , "See; advert" , "Advance warning of an event" , "Warning - observe - review" .)

I've seen this clue in The Telegraph.
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