Friends round to make a hit (4)
I believe the answer is:
slap
'a hit' is the definition.
(both can mean to strike)
'friends round' is the wordplay.
'friends' becomes 'pals' (pal is a kind of friend).
'round' shows that the letters should be reversed in order.
'pals' back-to-front is 'SLAP'.
'to make' acts as a link.
(Other definitions for slap that I've seen before include "A blow among pals" , "Right" , "Hit with the palm" , "Make-up (slang)" , "Blow with open hand" .)