Art -, US jazz pianist born in 1909 known for his improvisation (5)

I believe the answer is:

tatum

(Other definitions for tatum that I've seen before include "O'Neal, film actress" , "Art -, US jazz pianist" , "Almost blind American jazz pianist Art, d. 1956" , "___ O'Neal, US child star and ex-Mrs McEnroe" , "Art ______, great jazz pianist" .)

I've seen this clue in The Mirror.

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