Never hit an unmarried woman (4)
I believe the answer is:
miss
'unmarried woman' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for miss that I've seen before include "Don't hit" , "Feel the absence of" , "Fail to get" , "Fail to locate" , "Suffer from the lack of" .)