Avoid bypass - waste of time (4)
I believe the answer is:
shun
'avoid' is the definition.
(shunning is a kind of avoiding)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for shun that I've seen before include "Persistently ignore" , "Cold-shoulder" , "Keep away from, have nothint to do with" , "Persistently reject" , "military command" .)