"She's the Man" star Channing (5)
I believe the answer is:
tatum
(Other definitions for tatum that I've seen before include "Almost blind American jazz pianist Art, d. 1956" , "Art ______, great jazz pianist" , "Ryan O'Neal's actress daughter" , "Art -, US jazz pianist" , "___ O'Neal, US child star and ex-Mrs McEnroe" .)