Ryan's daughter (5)
I believe the answer is:
tatum
'ryan's daughter' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tatum that I've seen before include "Art -, US jazz pianist" , "___ O'Neal, US child star and ex-Mrs McEnroe" , "Ryan O'Neal's actress daughter" , "O'Neal, film actress" , "Almost blind American jazz pianist Art, d. 1956" .)