Character found in kids' books (5)
I believe the answer is:
waldo
'character found in kids' books' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for waldo that I've seen before include "Ralph - Emerson, US poet, philosopher" , "See 8" , "Ralph -- Emerson, author" , "name Emerson had" , "Low ad (anag) - boy's name" .)