Donkey with a pinned-on tail
I believe the answer is:
eeyore
'donkey with a pinned-on tail' 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 "Gloomy donkey in Winnie-the-Pooh books" , "One of Pooh's friends" , "8's donkey friend" , "Christopher Robin's dismal donkey" , "Donkey, 19's friend" .)