Female teacher (12)
I believe the answer is:
headmistress
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">female teacher</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a female headteacher)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for headmistress that I've seen before include "Teacher" , "School principal" , "Female school leader" , "Person in charge of a school" .)