It tastes heavenly washed down with nectar! (8)

I believe the answer is:

ambrosia

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'nectar' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

(Other definitions for ambrosia that I've seen before include "luxury food" , "Siam boar as food for the gods" , "meal fit for gods" , "Food of classical gods" , "dish fit for the gods when cooked without salt" .)

I've seen this clue in the Evening Standard.

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