Cut up about greeting piece of early evidence? (7,1)
I believe the answer is:
exhibit a
'piece of early evidence?' is the definition.
I know nothing about this answer so I can't tell whether this works.
'cut up about greeting' is the wordplay.
I cannot quite see how this works, but
'cut' could be 'bit' (I've seen this in other clues) and 'bit' is found within the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is found in the answer.
'greeting' could be 'hi' (hi is a kind of greeting) and 'hi' is present in the answer.
The remaining letters 'ex' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?