Unpleasantly humid (6)
I believe the answer is:
clammy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unpleasantly humid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for clammy that I've seen before include "Unpleasantly sticky and moist" , "Wet and sticky" , "Stewing" , "Unpleasantly cool and humid" , "Moist and adhesive" .)