Daughter of Cronus (4)
I believe the answer is:
hera
'daughter of cronus' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hera that I've seen before include "marriage goddess" , "Sister and wife of 18" , "Divinity" , "Greek queen of Olympian gods" , "Zeus's wife and sister" .)