Never hit a maiden lady (4)
I believe the answer is:
miss
'lady' is the definition.
(I have seen 'Young lady' mean 'miss' so perhaps 'lady' could also mean 'miss')
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for miss that I've seen before include "maiden" , "Fail to hit (something)" , "Young girl" , "state" , "Single girl" .)