That's how pie ceremony reveals a fine specimen (9)

I believe the answer is:

showpiece

'a fine specimen' is the definition.

'that's how pie ceremony reveals' is the wordplay.
'reveals' indicates a hidden word.
'SHOWPIECE' is hidden within 'thats how pie ceremony'.

(Other definitions for showpiece that I've seen before include "Item of work presented for display" , "shining example" , "fine specimen of its kind" , "Outstanding example" , "jewel" .)

I've seen this clue in The Guardian.

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