Crossword Genius

What was that you said hospitably to the departing guest? (4,5)

Ross

I believe the answer is:

come again

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for come again that I've seen before include "Please clarify" , "I don't understand that" , "eh?" , "You're welcome to return - pardon?" , "I'm sorry?" .)

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