Crossword Genius

Railways tea? (4)

Ross

I believe the answer is:

brew

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'tea?' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for brew that I've seen before include "Ferment rather than distil" , "Ferment, concoct" , "Steep" , "Infuse" , "Infusion" .)

I've seen this clue in the Evening Standard.
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