Fail to get a maiden (4)
I believe the answer is:
miss
I believe this clue is a double definition.
'fail to get' is the first definition.
(I've seen this before)
'a maiden' is the second definition.
(I've seen this before)
(Other definitions for miss that I've seen before include "Pine for - young lady" , "Young woman" , "Girl or unmarried woman" , "Agatha Christie's detective" , "Overlook - misfire - young lady" .)