Being sharp, maybe hurts no end! (6)
I believe the answer is:
thrust
'no end' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'being sharp maybe hurts' is the wordplay.
'being sharp' becomes 't' (I can't explain this - if you can you should believe this answer much more).
'maybe' indicates anagramming the letters.
'hurts' anagrammed gives 'hrust'.
't'+'hrust'='THRUST'
Can you help me to learn more?
(Other definitions for thrust that I've seen before include "Push forcefully" , "Lunge forward" , "Push powerfully; stab" , "Push forward with truths" , "Sudden movement - main gist" .)