Female monster (6)
I believe the answer is:
ogress
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">female monster</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ogress that I've seen before include "Monstrous female" , "Female giant in fairytales" , "earsome lady" , "Frightful woman" , "Terrifying woman" .)