Bitter-smelling (5)
I believe the answer is:
acrid
'bitter-smelling' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for acrid that I've seen before include "Nastily pungent" , "Having a bitter taste or small, like smoke" , "Bitter - caustic" , "Unpleasantly pungent" , "Bitter - pungent" .)