Result of bombing run by old plane (6)
I believe the answer is:
crater
'result of bombing' is the definition.
'run by old plane' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'by' says to put letters next to each other.
'old plane' becomes 'crate' (informal term for an old vehicle).
'r' put after 'crate' is 'CRATER'.
(Other definitions for crater that I've seen before include "Hole (on the moon?)" , "Large hole" , "Bowl-shaped opening" , "Pit resulting from impact or explosion" , "Hole left by bomb" .)