Crossword Genius

Hitchhiker’s sign (5)

Ross

I believe the answer is:

thumb

(Other definitions for thumb that I've seen before include "Attempt to obtain a lift" , "Quickly turn pages" , "Hitch (a lift)" , "Indicate need for lift" , "''Tom ..., the piper's son'' (nursery rhyme)" .)

I've seen this clue in The Guardian.
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