Sharply stinging (5)
I believe the answer is:
acrid
'sharply stinging' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for acrid that I've seen before include "Sharp - biting" , "Greek goddess" , "Pungent; caustic" , "Bitter - caustic" , "Direly pungent" .)