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In this way, energy's extracted from so-called melting pot (4)

Ross

I believe the answer is:

thus

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'in this way' is the definition.
(synonyms)

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(Other definitions for thus that I've seen before include "As a result" , "as indicated" , "Like so" , "In this way" , "an original Christmas gift" .)

I've seen this clue in The Guardian.
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