Crossword Genius

Repeatedly revolve (one’s thumbs, eg) (7)

Ross

I believe the answer is:

twiddle

(Other definitions for twiddle that I've seen before include "Tinker with" , "Play with (one's thumbs)" , "Twirl (thumbs?)" , "Manipulate (one's thumbs)" , "Jiggle" .)

I've seen this clue in The Times.
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