Christopher Robin's friend (4)
I believe the answer is:
pooh
'christopher robin's friend' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pooh that I've seen before include "Literary bear" , "Milne's bear" , "Expression of contempt" , "that smells horrible" , "A.A. Milne's lover of hunny (sic)" .)