Goddess lives twice (4)
I believe the answer is:
isis
'goddess' is the definition.
(Egyptian god)
'lives twice' is the wordplay.
'lives' becomes 'is' ('be' can be a synonym of 'live').
'twice' shows that letters should be duplicated.
'is' duplicated is 'ISIS'.
(Other definitions for isis that I've seen before include "Egyptian deity" , "Wife of Osiris" , "academic stream?" , "Oxford river; goddess" , "Sister of Osiris" .)