Companion of 1930’s radio character The Lone Ranger (5)

I believe the answer is:

tonto

(Other definitions for tonto that I've seen before include "The Lone Ranger's companion" , "Lone Ranger and - -" , "The Lone Ranger's sidekick" , "Lone Ranger's scout" , "Western companion" .)

I've seen this clue in The Mirror.

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