Wayward Roman girl (5)
I believe the answer is:
'girl' is the definition.
'wayward roman' is the wordplay.
'wayward' is an anagram indicator.
'roman' is an anagram of 'NORMA'.
(Other definitions for norma that I've seen before include "Shearer or Major" , "The 'Rule' constellation" , "Female" , "Bellini heroine" , "Bellini opera - girl's name" .)