Crossword Genius

1979 stage play by Caryl Churchill (5,4)

Ross

I believe the answer is:

cloud nine

(Other definitions for cloud nine that I've seen before include "Situation of great elation" , "If you're on this, you're extremely happy" , "On which one is blissfully happy" , "On this, one is extremely happy" .)

I've seen this clue in The Mirror.
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