A A Milne character (6)
I believe the answer is:
eeyore
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a a milne character</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eeyore that I've seen before include "donkey in wood" , "Piglet's sad friend" , "Gloomy donkey in Winnie-the-Pooh books" , "Miserable donkey" , "miserable ass" .)