Olympian queen (4)
I believe the answer is:
hera
'olympian queen' 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 "Jealous sister and wife of Zeus" , "Queen whose Roman counterpart was Juno" , "Consort of Zeus" , "Greek queen of Olympian gods" , "Regularly-deceived wife" .)