Move forward, carrying large club (8)
I believe the answer is:
bludgeon
'club' is the definition.
(both can mean a heavy weapon)
'move forward carrying large' is the wordplay.
'move' becomes 'budge' (to budge is to move slightly).
'forward' becomes 'on'.
'carrying' is an insertion indicator.
'large' becomes 'L' (eg in clothes sizes).
'budge'+'on'='budgeon'
'budgeon' going around 'l' is 'BLUDGEON'.
(Other definitions for bludgeon that I've seen before include "Club used as a weapon" , "(Beat with a) heavy stick" , "Blunt instrument" , "Strike with a club" , "Cudgel" .)