Crossword Genius

Cut up about greeting piece of early evidence? (7,1)

Ross

I believe the answer is:

exhibit a

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'piece of early evidence?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'cut up about greeting' is the wordplay.
I cannot really see how this works, but
'cut' could be 'bit' (I've seen this in other clues) and 'bit' is present in the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is located in the answer.
'greeting' could be 'hi' (hi is a kind of greeting) and 'hi' is found within the answer.
The remaining letters 'ex' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

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