Unpleasantly wet and cold (4)
I believe the answer is:
dank
'unpleasantly wet and cold' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for dank that I've seen before include "Unpleasantly moist" , "Cold and moist" , "Unpleasantly cold and humid" , "Damp, cold, musty" , "Unpleasantly wet and cold" .)