Lack a young lady (4)
I believe the answer is:
miss
I believe this is a double definition.
'lack' is the first definition.
(I know that lack can be written as miss)
'a young lady' is the second definition.
(term of address for a young woman)
(Other definitions for miss that I've seen before include "Fail to notice; avoid" , "Fail to see or hit" , "Yearn for" , "Fail to catch" , "maiden" .)