Shot back, mad (4)
I believe the answer is:
stab
'shot' is the definition.
(I know that shot is a type of shot)
'back mad' is the wordplay.
'back' says the letters should be written in reverse.
'mad' becomes 'bats' (informal term for mad).
'bats' in reverse letter order is 'STAB'.
(Other definitions for stab that I've seen before include "Go" , "Puncture" , "Strike with knife" , "Wound with blade" , "Run through - essay" .)