The most common and most likely answer to this crossword clue is the 9 letter word CALUMNIES
I've seen this crossword clue in The Daily Telegraph
C
A
L
U
M
N
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S
More clues leading to the result CALUMNIES
Buddy explains!
The straight part
We know that "pork pies" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pork pies = calumnies.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CALUMNIES mean?
CALUMNIES noun- A false accusation or charge brought to tarnish another's reputation or standing.
- Falsifications or misrepresentations intended to disparage or discredit another.
- To make false accusations or levy false charges against a person with the intent to tarnish that person's reputation or standing; to calumniate.