Crossword Genius

How to kill time with your thumbs? (7)

Ross

I believe the answer is:

twiddle

(Other definitions for twiddle that I've seen before include "Tinker with" , "Play idly (with something)" , "Play with (one's thumbs)" , "Play nervously (with something)" , "Turn in a purposeless way" .)

I've seen this clue in The Guardian.
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