Greek goddess of marriage (4)
I believe the answer is:
'greek goddess of marriage' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hera that I've seen before include "Divinity" , "Queen whose Roman counterpart was Juno" , "female Greek deity" , "Zeus's wife and sister" , "Regularly-deceived wife" .)