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