Crossword Genius

Goodness, what do I say to the ambassador? (10)

Ross

I believe the answer is:

excellency

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'the ambassador?' is the definition.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for excellency that I've seen before include "Ambassador's honorific title" , "title given to envoy" .)

I've seen this clue in the Evening Standard.
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