Forsaken child (4)
I believe the answer is:
waif
'forsaken child' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for waif that I've seen before include "Forsaken child" , "Neglected or orphaned child" , "An unowned or abandoned child" , "Be incongruous" , "Gamin" .)