Pooh's grumpy pal (6)
I believe the answer is:
'pooh's grumpy pal' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eeyore that I've seen before include "donkey in wood" , "One of Pooh's friends" , "A. A. Milne donkey" , "Donkey, 19's friend" , "Pooh's gloomy donkey friend" .)