Artillery hit car end-on (8)
I believe the answer is:
ordnance
'artillery' is the definition.
('ordnance' can be a synonym of 'artillery')
'hit car end-on' is the wordplay.
'hit' is an anagram indicator.
'car'+'end'+'on'='carendon'
'carendon' is an anagram of 'ORDNANCE'.
(Other definitions for ordnance that I've seen before include "The Survey provides maps" , "Mounted guns, cannon" , "weapons" , "guns etc." , "Car on end (anag) - artillery" .)