Draw, having lost lead -- damage done (4)
I believe the answer is:
harm
'draw' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for harm that I've seen before include "Hurt, maim" , "Hurt, injure" , "Detriment" , "Short-long metric feet" , "Trials, exams" .)