Will give the slip to? I don't believe you! (3,4)
I believe the answer is:
get away
'i don't believe you' is the definition.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for get away that I've seen before include "Never" , "The car that provides escape for criminal" , "Escape; short holiday" , "take a holiday" , "Breakout" .)