Crossword Genius

Hitchhiker's digit (5)

Ross

I believe the answer is:

thumb

'hitchhiker's digit' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for thumb that I've seen before include "Tom ___ , traditional hero of English folklore" , "Hitch-hiker's tool" , "Opposable digit" , "Hitchhike - ..... a lift" , "Second part of 12" .)

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