Crossword Genius

Betrayed but not executed? (6)

Ross

I believe the answer is:

undone

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'betrayed' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how they can define each other.

'not executed?' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'executed?' becomes 'done' (execute can mean to do or accomplish).
'un'+'done'='UNDONE'

'but' is the link.

Can you help me to learn more?

(Other definitions for undone that I've seen before include "Ruined - no longer fastened" , "Not finished; ruined" , "Not finished; untied" , "Not bound" , "Annulled; untied" .)

I've seen this clue in The Sun.
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