Cryptic crossword clue
As swine in decay, they can’t fly 11

The most common and most likely answer to this crossword clue is the 11 letter word CASSOWARIES

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

The straight part
We know that "they can’t fly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they can’t fly = cassowaries.
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 CASSOWARIES mean?

CASSOWARIES noun
  1. A large flightless bird of the genus Casuarius that is native to Australia and New Guinea, has a characteristic bony crest on its head, and can be very dangerous.

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