Old priest first to finish pork pie (3)

I believe the answer is:

lie

'pork pie' is the definition.
(I've seen this in other clues)

I don't understand the rest of the clue.

(Other definitions for lie that I've seen before include "Disinformation" , "Mistruth" , "Untruth; rest" , "Tell untruths" , "Rest; deception" .)

I've seen this clue in The Times.

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