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Harden by heat (6)

Ross

I think it could be either:

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4

6

anneal

(Other definitions for anneal that I've seen before include "Harden by heating and cooling" , "toughening process" , "Treat (metal, glass) with heat" , "Toughen by heating and slow cooling" , "Make tough" .)

I've seen this clue in The Guardian.
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