Friend of Tigger
I believe the answer is:
roo
'friend of tigger' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for roo that I've seen before include "Marsupial (abbrev.)" , "Small inhabitant of Hundred Acre Wood" , "Marsupial (Aus. colloq.)" , "Australian jumper" , "Kangaroo (Austr. colloq.)" .)