Noël Coward play featuring the character Madame Arcati (6,6)

I believe the answer is:

blithe spirit

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

I've seen this clue in The Independent.

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