Sorry I've messed up making changes (8)

I believe the answer is:

revisory

I'm a little stuck... Click here to teach me more about this clue!

'sorry i've messed up making changes' is the definition.
I can't tell whether this definition defines the answer.

'sorry i've messed up' is the wordplay.
'messed up' indicates an anagram.
'sorry'+'ive'='sorryive'
'sorryive' anagrammed gives 'REVISORY'.

Can you help me to learn more?

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app