Crossword Genius

Everyone taking part completely exhausted (3,2)

Ross

I believe the answer is:

all in

'completely exhausted' is the definition.
(I've seen this before)

'everyone taking part' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'taking' is a charade indicator (letters next to each other).
'part' becomes 'in' ('in part' can be a synonym of 'part').
'all'+'in'='ALL-IN'

(Other definitions for all in that I've seen before include "With everything included" , "At an inclusive price; exhausted" , "Worn-out" , "Including everything" , "Inclusive; tired" .)

I've seen this clue in The Times.
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