Gretel's brother (6)
I believe the answer is:
hansel
'gretel's brother' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hansel that I've seen before include "abandoned boy" , "Good luck gift" , "Grimm child" , "Brother of 9 Down in Grimms' fairytale and opera by Engelbert Humperdinck" , "... and Gretel (fairy story)" .)