He may be beside himself when beaten! (3)

I believe the answer is:

tom

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'he' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for tom that I've seen before include "type pursuing queen" , "Hoyden" , "Waits, perhaps" , "Man's name; male cat" , "He is associated with Dick and Harry" .)

I've seen this clue in the Evening Standard.

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