Don’t hit silly young girl (4)
I believe the answer is:
miss
I believe this is a double definition.
'don't hit' is the first definition.
(to miss is to fail to hit)
'silly young girl' is the second definition.
(term of address for a young girl)
(Other definitions for miss that I've seen before include "Fail to locate" , "Fail to catch" , "Fail to meet - girl" , "Fail to reach" , "One is as good as a mile" .)