Cain worried about set that's divine (7)
I believe the answer is:
angelic
'that's divine' is the definition.
(I've seen this before)
'cain worried about set' is the wordplay.
'worried' indicates anagramming the letters.
'about' is an insertion indicator.
'set' becomes 'gel' (both can mean to harden).
'cain' anagrammed gives 'anic'.
'anic' placed around 'gel' is 'ANGELIC'.
(Other definitions for angelic that I've seen before include "Sweet, kind and beautiful" , "Nice gal (anag.)" , "Nice gal looking heavenly" , "sweet-natured too" , "Saintly" .)