Pooh's mopey pal (6)
I believe the answer is:
eeyore
'pooh's mopey pal' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eeyore that I've seen before include "A. A. Milne donkey" , "Pooh's sad friend" , "Piglet's sad friend" , "Christopher Robin's dismal donkey" , "Literary donkey" .)