Madame Arcati holds a seance in this Noël Coward play (6,6)

I believe the answer is:

blithe spirit

(Other definitions for blithe spirit that I've seen before include "Comedy" , "written for a lark by poet" , "Phil is bitter (anag) - Noel Coward play" , "Noel Coward play (Madame Arcati)" , "Coward acts" .)

I've seen this clue in The Sunday Times and The Times.

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