Fail to see (4)
'fail to see' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for overlook that I've seen before include "Ignore or fail to see" , "Miss; forgive" , "Fail to observe or consider" , "Give a view from above - miss" , "Ignore or fail to notice" .)
'fail to see' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for miss that I've seen before include "Young girl" , "Pine for - young lady" , "Fail; long for" , "Fail to meet - girl" , "someone who isn't married" .)