Add repeat, changed and modified again (9)

I believe the answer is:

readapted

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'modified again' is the definition.
The answer and definition can be both related to change as well as being past participle verbs.
Maybe there's an association between them I don't understand?

'add repeat changed' is the wordplay.
'changed' is an anagram indicator.
'add'+'repeat'='addrepeat'
'addrepeat' is an anagram of 'READAPTED'.

'and' is the link.

Can you help me to learn more?

I've seen this clue in The Daily Express.

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