Nominally, Nina's unusually noted (5)
I believe the answer is:
annie
'nominally nina's unusually noted' is the definition.
I can't judge whether this definition defines the answer.
'nominally nina's' is the wordplay.
I cannot really see how this works, but
an anagram of 'nina' is 'anni' which is within the answer.
A single letter 'e' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for annie that I've seen before include "1977 Broadway musical" , "Musical about red-handed Orphan girl" , "- Get your Gun, musical" , "musical movie" , "Miss Laurie" .)