Excellent American expert probing Egyptian language (9)

I believe the answer is:

copacetic

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'excellent' is the definition.
(I've seen this before)

'american expert probing egyptian language' is the wordplay.
'american expert' becomes 'ace' (ace can informally mean very good. I am not sure about the 'american' bit.).
'probing' indicates putting letters inside (probe can mean to make a hole in).
'egyptian language' becomes 'coptic' (I've seen this before).
'ace' placed inside 'coptic' is 'COPACETIC'.

Can you help me to learn more?

(Another definition for copacetic that I've seen is " Excellent".)

I've seen this clue in The Independent.

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