Crossword Genius

Torture device (10)

Ross

I believe the answer is:

thumbscrew

(Other definitions for thumbscrew that I've seen before include "That could be unpleasant!" , "It puts the squeeze on" , "excruciating instrument" , "Instrument of torture (crushing the pollex)" , "agonised by it?" .)

I've seen this clue in the Evening Standard.
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