Hit pals around (4)
I believe the answer is:
slap
'hit' is the definition.
(both can mean to strike)
'pals around' is the wordplay.
'around' says the letters should be written backwards.
'pals' in reverse letter order is 'SLAP'.
(Other definitions for slap that I've seen before include "Sharp smack" , "Make-up (slang)" , "Hit with an open hand" , "Mild punishment" , "Strike with the palm" .)