Hot and sticky (5)
I believe the answer is:
humid
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hot and sticky</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for humid that I've seen before include "Describes air that contains a great deal of water vapour" , "Dank" , "Close" , "Moist (atmosphere)" , "Muggy" .)