Great celebration about a show (6)
I believe the answer is:
reveal
'a show' is the definition.
(I know that reveal is a more specific form of the action show)
'great celebration about' is the wordplay.
I cannot really understand how this works, but
'about' could be 're' (regarding) and 're' is found within the answer.
The remaining letters 'veal' 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?
(Other definitions for reveal that I've seen before include "Spill beans" , "Disclose, make apparent" , "Tell the truth" , "Final disclosure" , "Remove cover to display" .)