Making changes to morning end in garden opening (8)

I believe the answer is:

amending

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'making changes to' is the definition.
I can't judge whether this definition defines the answer.

'morning end in garden opening' is the wordplay.
'morning' becomes 'am' (as in 12:00 AM).
'opening' suggests taking the first letters.
The initial letter of 'garden' is 'g'.
'am'+'end'+'in'+'g'='AMENDING'

Can you help me to learn more?

(Other definitions for amending that I've seen before include "Changing situation" , "reforming" , "Modifying" , "Correcting" , "Altering for the better" .)

I've seen this clue in the Sydney Morning Herald.

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