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 this works.
'best sit around' is the wordplay.
'best' becomes 'top' (top can mean the very best).
'around' is an insertion indicator.
'top' going into 'sit' is 'STOP IT'.
'and' is the link.
Can you help me to learn more?
(Other definitions for stop it that I've seen before include "Desist!" , "Don't" .)