Dizziness (7)
I believe the answer is:
vertigo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dizziness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for vertigo that I've seen before include "Type of dizziness associated with fear of heights" , "Dizziness at height" , "Sensitivity to heights" , "unbalanced feeling" , "Forty Thieves' password" .)