Opposite of blunt (5)
I believe the answer is:
sharp
'opposite of blunt' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sharp that I've seen before include "Clearly defined (image)" , "Not blunt" , "Acidic; note" , "Acute - very keen" , "Above true pitch; stylish" .)