Mad Hatter's guest (5)
I believe the answer is:
alice
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mad hatter's guest</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for alice that I've seen before include "She ate the "Eat Me" and drank the "Drink Me"" , "Wonderland girl's name" , "Carroll heroine" , "... Walker, ... Munroe (writers)" , "Movement" .)