"Rubber Duckie" Muppet (5)
I believe the answer is:
ernie
'rubber duckie muppet' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ernie that I've seen before include "One regularly drawing" , "Premium Bonds selection computer" , "Old computer" , "Premium?bond computer" , "Name given to selector" .)