Like a damp cellar (4)
I believe the answer is:
dank
'like a damp cellar' 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 "(Of atmosphere) wet and unpleasant" , "Chilly and clammy" , "Cold and moist" , "Unpleasantly moist" , "Unpleasantly wet and cold" .)