Projectile to shoot wolf (4)
I believe the answer is:
bolt
I believe this clue is a triple definition!
'projectile' is the first definition.
(bolt can mean a heavy arrow)
'to shoot' is the second definition.
(both can mean to move very fast)
'wolf' is the third definition.
(both can mean to eat something)
(Other definitions for bolt that I've seen before include "one may be shot" , "From the blue, it's a great surprise" , "Flee with door-locking device" , "Fasten shut; run away" , "Latch" .)