Wife of Hercules (4)
I believe the answer is:
hebe
'wife of hercules' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hebe that I've seen before include "Greek goddess of youth, wife of Hercules" , "Youth personified" , "Daughter of Zeus and Hera" , "Goddess of youth and flowering shrub" , "Cup-bearer of the gods and flowering shrub" .)