Urge on a naughty child, another one not following (5)
I believe the answer is:
impel
'urge on' is the definition.
(I've seen this in another clue)
'a naughty child another one not following' is the wordplay.
'a naughty child' becomes 'imp' (informal term for a misbehaving child).
'another' becomes 'e' (I've seen this in other clues).
'one not following' becomes 'l' (I can't justify this - if you can you should believe this answer much more).
'imp'+'e'+'l'='IMPEL'
(Other definitions for impel that I've seen before include "Drive or coerce" , "Urge forward, drive" , "Urge or propel" , "Urge or force to action" , "Press on - drive forward" .)