Crossword Genius

Moon's edges blurred, I say! (8,2)

Ross

I believe the answer is:

goodness me

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

'blurred i say' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'moon's edges' is the wordplay.
'moon's edges' can be anagrammed to 'GOODNESS ME'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Another definition for goodness me that I've seen is " Well, well!".)

I've seen this clue in The Telegraph.
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