Olympian queen and husband are returning (4)
I believe the answer is:
hera
'olympian queen' is the definition.
(I've seen this in another clue)
'husband are returning' is the wordplay.
'husband' becomes 'h'.
'returning' shows that the letters should be reversed in order.
'are' reversed gives 'era'.
'h'+'era'='HERA'
'and' is the link.
(Other definitions for hera that I've seen before include "Greek goddess" , "Regularly-deceived wife" , "Jealous sister and wife of Zeus" , "Zeus's wife and sister" , "Greek queen of Olympian gods" .)