Hard-to-find children's book character (5)

I believe the answer is:

waldo

(Other definitions for waldo that I've seen before include "Ralph -- Emerson, US poet/essayist" , "Low ad (anag) - boy's name" , "Ralph - Emerson, US poet, philosopher" , "Ralph -- Emerson, author" , "Ralph ----- Emerson, US poet and essayist" .)

I've seen this clue in the USA Today.

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