Vertiginous (5)
I believe the answer is:
giddy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vertiginous</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that vertiginous can be written as giddy)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for giddy that I've seen before include "Dizzy - flighty" , "Frivolous -- liable to fall" , "Dizzy or frivoloous" , "Frivolous - in a spin?" , "Faint - excited" .)