Language he's left to develop (4)

I believe the answer is:

brew

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'to develop' is the definition.
(I've seen this in another clue)

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

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(Other definitions for brew that I've seen before include "A pot of tea?" , "Ferment, concoct" , "Mixture" , "Prepare by boiling and infusing" , "Plot" .)

I've seen this clue in The Times.

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