Betrayal of one's country (7)

I believe the answer is:

treason

'betrayal of one's country' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for treason that I've seen before include "One rats (anag)" , "Betrayal of one's nation" , "Deliberate act of betrayal" , "LEse-majestE" , "One's art? (anag)" .)

I've seen this clue in The Telegraph, the Sydney Morning Herald and The Times.

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