Not taking vile nag out (7)
I believe the answer is:
leaving
'not taking vile nag out' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'vile nag out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'vile'+'nag'='vilenag'
'vilenag' anagrammed gives 'LEAVING'.
Can you help me to learn more?
(Other definitions for leaving that I've seen before include "Bequeathing (in will)" , "Going away" , "Departure" , "Abandoning" , "Departing" .)