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