Crossword Genius

Seventh heaven (7)

Ross

I think it could be either:

ecstasy

nirvana

(Other definitions for nirvana that I've seen before include "State of ideal happiness" , "Kurt Cobain's grunge band" , "Iran van (anag) - blissful state!" , "State of perfect happiness" , "Buddhist version of Paradise" .)

I've seen this clue in The Guardian, The New York Times and The Wall Street Journal.
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