____ was the main activity in the TV show Whose Line Is It Anyway (6)

I believe the answer is:

improv

(Other definitions for improv that I've seen before include "Stand-up comedy, perhaps" , "Off-the-cuff comedy" , "little ad-libbing" , "off-the-cuff humour" .)

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

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