Young female (4)
I believe the answer is:
girl
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">young female</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 girl that I've seen before include "Lassie" , "Young woman" , "See 5" , "Female child" , "Lass" .)