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