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Under control, remove phosphorous and boron from copper zinc alloy (2,5)

Ross

I believe the answer is:

in check

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'under control' is the definition.
(synonyms)

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(Other definitions for in check that I've seen before include "Restrained" , "Under control" , "Attacked" , "State of chess king under direct attack" .)

I've seen this clue in The Times.
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