Control stream's new course (6)
I believe the answer is:
master
'new course' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'control stream's' is the wordplay.
'control' is an anagram indicator.
'stream' with letters rearranged gives 'MASTER'.
Can you help me to learn more?
(Other definitions for master that I've seen before include "Teacher to gain control" , "Lord - controller - teacher" , "One in complete control; great artist" , "Schoolteacher" , "Overcome; original copy" .)