Masters new course (6)

I believe the answer is:

stream

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'course' is the definition.
(I know that stream is a type of course)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for stream that I've seen before include "Small narrow river" , "schoolchildren grouped together" , "Brook or rivulet" , "Rill, brook" , "'Brook, runnel (6)'" .)

I've seen this clue in The Mirror.

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