Bert's kid-vid pal (5)
I believe the answer is:
ernie
'bert's kid-vid pal' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ernie that I've seen before include "Guy" , "- (the Fastest Milkman in the West) (Benny Hill)" , "Old computer" , "Eric's TV partner" , "Machine that produces the winning Premium Bond numbers" .)