Cryptic crossword clue
Sounded like pigs in old used pen 6

The most common and most likely answer to this crossword clue is the 6 letter word OINKED

I've seen this crossword clue in The Sunday Telegraph
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Buddy explains!

The straight part
We know that "Sounded like pigs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sounded like pigs = oinked.
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 OINKED mean?

OINKED verb
  1. Of a pig or in imitation thereof, to make its characteristic sound.

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