Get involved in someone else's business? (5)
I believe the answer is:
merge
'get' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for merge that I've seen before include "Join into one" , "Combine into one" , "Amalgamate" , "Join, blend" , "Fuse" .)