Lunar vehicle runs past (5)
I believe the answer is:
rover
'lunar vehicle' is the definition.
(I've seen this in another clue)
'runs past' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'past' becomes 'over' (both can mean finished).
'r'+'over'='ROVER'
(Other definitions for rover that I've seen before include "Wanderer, rolling stone" , "Vehicle driven remotely over extraterrestrial terrain" , "rambler" , "Old scout" , "one in Bristol, one in Doncaster, perhaps" .)