Stuffing not put back in bear (10)
I believe the answer is:
paddington
'bear' is the definition.
(I've seen this before)
'stuffing not put back' is the wordplay.
'stuffing' becomes 'padding' (padding is a kind of stuffing).
'put back' says the letters should be written in reverse.
'not' reversed gives 'ton'.
'padding'+'ton'='PADDINGTON'
'in' acts as a link.
(Other definitions for paddington that I've seen before include "London station - famous bear" , "London rail terminus" , "A figure child might want for Play" .)