Relative loses the head with local informer? Don't get involved! (3,3)
I believe the answer is:
opt out
'get involved' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how they can define each other.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for opt out that I've seen before include "Decide to withdraw" , "Decline to participate" , "Choose not to participate" , "'Choose not to take part (3,3)'" , "Choose to be excluded" .)