Wife of Jupiter (4)
I believe the answer is:
juno
'wife of jupiter' is the definition.
(I know that Jupiter is married to Juno)
This is all the clue.
(Other definitions for juno that I've seen before include "Jupiter's wife" , "She played with the Paycock" , "In Roman myth, goddess ofmarriage - to Paycock?" , ". . . . and the Paycock (Sean O'Casey)" , "Roman queen of the gods, wife and sister of Jupiter" .)