Opera singer, new in Norma, paid badly (5,5)
I believe the answer is:
prima donna
'opera singer' is the definition.
(thesaurus)
'new in norma paid badly' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'in' is an insertion indicator.
'badly' indicates anagramming the letters.
'norma'+'paid'='normapaid'
'normapaid' anagrammed gives 'primadona'.
'n' put into 'primadona' is 'PRIMA DONNA'.
(Other definitions for prima donna that I've seen before include "a right madam?" , "Leading lady, proverbially temperamental" , "lady centre stage" , "temperamental sort" , "opera star - with 2d" .)