Acknowledging one was wrong to have taken the seat? (8,9)

I believe the answer is:

standing corrected

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'taken the seat?' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs sometimes mean the same thing.

'acknowledging one was wrong' is the wordplay.
I cannot quite see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found within the answer.
This explanation may well be incorrect...

'to have' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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