Finish replacing information in a discipline showing effective control (10)

I believe the answer is:

ascendence

'effective control' is the definition.
(state of domination or control)

'finish replacing information in a discipline' is the wordplay.
I cannot quite understand how this works, but
'finish' could be 'end' (synonyms) and 'end' is located in the answer.
'a' is within the answer.
This explanation may well be incorrect...

'showing' acts as a link.

I've seen this clue in The Guardian.

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