Christopher Robin's pal (4)
I believe the answer is:
pooh
'christopher robin's pal' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pooh that I've seen before include "What a stink!" , "that was disgusting!" , "Literary bear" , "Famous bear" , "A.A. Milne's lover of hunny (sic)" .)