Masters is included in courses (7)

I believe the answer is:

streams

I'm a little stuck... Click here to teach me more about this clue!

'courses' is the definition.
(I know this)

'masters is included' is the wordplay.
'masters' anagrams to 'STREAMS'.
Though, I'm unsure how the anagram is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for streams that I've seen before include "Brooks" , "Rills" , "Torrents" , "Masters (anag.)" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.