Intoxicating (5)
I believe the answer is:
heady
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">intoxicating</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for heady that I've seen before include "Impetuous" , "Inebriating" , "Extremely exciting" , "Potent, intoxicating" .)