Crossword Genius

Make beer, soundly, in the broom cupboard (4)

Ross

I believe the answer is:

brew

I'm a little stuck... Click here to teach me more about this clue!

'make beer' is the definition.
(I've seen this in another clue)

I cannot 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" , "Infuse" , "Concoction" , "Ferment rather than distil" , "Plot" .)

I've seen this clue in the Evening Standard.
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