Missile; pointer (5)
I believe the answer is:
arrow
I believe this clue is a double definition.
'missile' is the first definition.
(arrow is a kind of missile)
'pointer' is the second definition.
(I know that pointer can be written as arrow)
(Other definitions for arrow that I've seen before include "Something pointing" , "pointer to the way forward" , "Archery projectile" , "Missile, bolt" , "Move swiftly" .)