Object forcibly propelled at a target (7)
I believe the answer is:
missile
'object forcibly propelled at a target' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for missile that I've seen before include "Weapon that's thrown or projected" , "Cruise, perhaps" , "Object forcibly propelled at a target" , "Projectile (sometimes guided)" , "Weapon that is propelled" .)