Divine sustenance (6)
(Other definitions for nectar that I've seen before include "Honey of flowers - drink of the gods" , "Divine beverage" , "Sugary stuff in plants to attract insects" , "Trance (anag)" , "Heavenly drink, may create trance" .)
(Other definitions for ambrosia that I've seen before include "Bee bread" , "Food of classical gods" , "luxury food" , "food for Olympians" , "Food of Greek and Roman gods" .)