Crossword Genius

Hitching tool (5)

Ross

I believe the answer is:

thumb

(Other definitions for thumb that I've seen before include "Opposable digit" , "Digit (used for making a hitch?)" , "Try to get free ride" , "One opposed to other manual workers" , "Indicate need for lift" .)

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