Sharper
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
keener
'sharper' is the definition.
('keen' can be similar in meaning to 'sharp')
This is all the clue.
(Other definitions for keener that I've seen before include "More devoted" , "person mourning" , "Funeral singer" , "Professional mourner" , "More enthusiastic or sharp" .)