Shearer on the screen (5)
I believe the answer is:
norma
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shearer on the screen</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for norma that I've seen before include "She incited Gauls v. Romans (Bellini)" , "Bellini opera - girl's name" , "Bellini's heroine" , "Girl's name - may be Roman" , "Marilyn was properly one" .)