Boo-Boo's buddy (4)
I believe the answer is:
yogi
'boo-boo's buddy' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yogi that I've seen before include "one accustomed to spirits" , "Hindu expert in spiritual discipline" , "Follower of a Hindu philosophy involving mind and body" , "One practises a Hindu philosophy" , "Practitioner of Hindu spiritual exercises" .)