Marilyn, originally (5)
I believe the answer is:
norma
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">marilyn originally</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for norma that I've seen before include "Roman (anag) -- opera" , "Marilyn was properly one" , "musical work" , "Bellini heroine" , "Bellini's heroine" .)