Hit with a heavy club (8)
I believe the answer is:
bludgeon
'hit with a heavy club' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bludgeon that I've seen before include "Blunt instrument" , "Thick stick as weapon" , "Club used as a weapon" , "Thick club" , "(Beat with a) heavy stick" .)