A goddess lives twice (4)
I believe the answer is:
isis
'a goddess' is the definition.
(I've seen this before)
'lives twice' is the wordplay.
'lives' becomes 'is' ('be' can be a synonym of 'live').
'twice' shows that letters should be duplicated.
'is' doubled is 'ISIS'.
(Other definitions for isis that I've seen before include "Jihadists" , "Sister of Osiris" , "River Thames at Oxford" , "The goddess lives twice" , "Divine female" .)