"The Wizard of Oz" dog (4)
I believe the answer is:
'the wizard of oz dog' 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 "Famous film dog" , "Dorothy's dog in The Wizard of Oz" , "[FRIEND OF DOROTHY]" , "member of the 5d band" .)