Defeat the stream's turbulence (6)

I believe the answer is:

master

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'defeat' is the definition.
(mastering is a kind of defeating)

'stream's turbulence' is the wordplay.
'stream' anagrams to 'MASTER'.
But, I'm not clear how this is indicated.

'the' is the link.

Can you help me to learn more?

(Other definitions for master that I've seen before include "Overcome; original copy" , "Skilful operator; teacher" , "Overcome; original film" , "Expert" , "Virtuoso" .)

I've seen this clue in the Evening Standard.

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