Fuss about right drill for attack (7)
I believe the answer is:
torpedo
'for attack' is the definition.
(torpedoing is a kind of attacking)
'fuss about right drill' is the wordplay.
'fuss' becomes 'todo' (both can mean a commotion).
'about' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'drill' becomes 'PE' (Physical Education).
'r'+'pe'='rpe'
'todo' enclosing 'rpe' is 'TORPEDO'.
(Other definitions for torpedo that I've seen before include "Trooped (anag.)" , "To wreck" , "Explosive underwater projectile" , "Trooped off with undersea missile" , "Destroy" .)