Best sit around and not continue (4,2)
I believe the answer is:
stop it
'not continue' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'best sit around' is the wordplay.
'best' becomes 'top' (top can mean the very best).
'around' is an insertion indicator.
'top' inserted inside 'sit' is 'STOP IT'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for stop it that I've seen before include "Desist!" , "Don't" .)