Start doing something new as a tree? (6,3)
I believe the answer is:
branch out
'start' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for branch out that I've seen before include "Expand" , "Take up new things" , "diversify" , "Extend activities in new direction" .)