Avoid rear-end collision when Tesla moves off (4)
I believe the answer is:
shun
'avoid' is the definition.
(shunning is a kind of avoiding)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for shun that I've seen before include "rigid standing order?" , "Send to Coventry" , "Parade-ground language" , "attention in the army" , "Steer clear of" .)