In this way, energy's extracted from so-called melting pot (4)
I believe the answer is:
thus
'in this way' is the definition.
(synonyms)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for thus that I've seen before include "As a result" , "as indicated" , "Like so" , "In this way" , "an original Christmas gift" .)