Humid and chilly (4)
I believe the answer is:
dank
'humid and chilly' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dank that I've seen before include "Damp, cold, musty" , "Unpleasantly cool and damp" , "Cold and moist" , "Chilly and clammy" , "(Of atmosphere) wet and unpleasant" .)