Bert's Sesame Street pal (5)
I believe the answer is:
ernie
'bert's sesame street pal' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ernie that I've seen before include "Wise, perhaps" , "Premium Bond picker" , "Male" , "Eric's other half" , "Wise fellow" .)