Crossword Genius

Beer made by witch? (4)

Ross

I believe the answer is:

brew

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'beer' is the definition.
(thesaurus)

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

Can you help me to learn more?

(Other definitions for brew that I've seen before include "Mixture" , "Concoction" , "Make (tea/coffee)" , "Ferment, concoct" , "Prepare by boiling and infusing" .)

I've seen this clue in The Sun.
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