Crossword Genius

Outwit champion concealing sudden move (6)

Ross

I believe the answer is:

twitch

'sudden move' is the definition.
(sudden twitch in the body)

'outwit champion concealing' is the wordplay.
'concealing' indicates a hidden word.
'TWITCH' is hidden in the letters of 'outwit champion'.

(Other definitions for twitch that I've seen before include "Move spasmodically" , "Uncontrolled, jerky motion" , "jump" , "Quiver or jerk spasmodically" , "Make a convulsive movement" .)

I've seen this clue in The Guardian.
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