Elusive fellow in kids' books (5)

I believe the answer is:

waldo

(Other definitions for waldo that I've seen before include "Ralph ----- Emerson, US poet and essayist" , "Ralph - Emerson, US poet, philosopher" , "Gizmo" , "See 8" , "Ralph -- Emerson, US poet/essayist" .)

I've seen this clue in the King Feature Syndicate.

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