Fail to hit on a young woman (4)
I believe the answer is:
miss
This clue is a double definition.
'fail to hit' is the first definition.
(I've seen this in another clue)
'young woman' is the second definition.
(title for a young woman)
'on a' is the link.
(Other definitions for miss that I've seen before include "Fail to locate" , "Single girl" , "Fail to notice; avoid" , "Fail to hit; girl" , "Omit" .)