Muppet with a rubber duckie (5)
I believe the answer is:
ernie
'muppet with a rubber duckie' 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 "--- Wise, comedian" , "- - Bevin, 13 dn" , "It picks Premium Bond winners" , "Wise, perhaps" , "Premium Bonds selector" .)