Move forward bearing large club (8)
I believe the answer is:
bludgeon
'club' is the definition.
(both can mean a heavy weapon)
'move forward bearing large' is the wordplay.
'move' becomes 'budge' (to budge is to move slightly).
'forward' becomes 'on'.
'bearing' is an insertion indicator.
'large' becomes 'L' (eg in clothes sizes).
'budge'+'on'='budgeon'
'budgeon' enclosing 'l' is 'BLUDGEON'.
(Other definitions for bludgeon that I've seen before include "Hit with a heavy club" , "Bully; heavy weapon" , "Thick stick with a heavy end" , "Stick or club with a heavy end" , "Beat repeatedly with a heavy object" .)