Natasha's heart stolen by guy's divine gift (5)
I believe the answer is:
manna
'divine gift' is the definition.
(as in manna from heaven)
'natasha's heart stolen by guy's' is the wordplay.
'heart stolen' says to hollow out the word (remove centre letters) (the heart or centre is removed).
'by' says to put letters next to each other.
'guy' becomes 'man' (I've seen this before).
'natasha' with its centre taken out is 'na'.
'na' put after 'man' is 'MANNA'.
(Other definitions for manna that I've seen before include "Heavenly nourishment" , "Divine nourishment" , "Free food (from heaven)" , "Sweet gum; an unexpected benefit" , "Old Testament food (from heaven?)" .)