Crossword Genius

Mixed zinc sulphide by day (7)

Ross

I believe the answer is:

blended

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'mixed' is the definition.
('blend' can be a synonym of 'mix')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for blended that I've seen is " Mixed together".)

I've seen this clue in the Sydney Morning Herald.
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