"Rosanna" band (4)
I believe the answer is:
toto
'rosanna band' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for toto that I've seen before include "member of the 5d band" , "[FRIEND OF DOROTHY]" , "Famous film dog" , "Dorothy's dog in The Wizard of Oz" .)