Well done, Lynne!
According to the OED, the definition is both 'English regional' and 'Australian' for "A scandalous or troublesome person or thing".
In particular, "The Lingo: Listening to Australian English" by Graham Seal (University of New South Wales Press, 1999) states: "Nointer is a Taswegianism for a precocious child or youth destined for a bad end".
*** 'ell, Seekerz, they set some damned hard crosswords in your part of the world!