That (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">that</span>' is the definition.<br/ ><span class="explanation-format__explanation">(archaic term meaning 'that')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Another definition for yon that I've seen is " Those Scots".)
(Other definitions for girl that I've seen before include "Lassie" , "A young female" , "Miss" , "See 5" , "Young woman" .)