Kill time with a line out (9)
I believe the answer is:
eliminate
'kill' is the definition.
(eliminating is a kind of killing)
'time with a line out' is the wordplay.
'with' says to put letters next to each other.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'a'+'line'='aline'
'time' after 'aline' is 'alinetime'.
'alinetime' is an anagram of 'ELIMINATE'.
(Other definitions for eliminate that I've seen before include "Remove from contention" , "defeat" , "Completely remove, get rid of" , "Knock out" , "put out" .)