Cryptic crossword clue
Broke vow: recorded and jammed 11

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

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

The straight part
We know that "jammed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case jammed = overcrowded.
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 OVERCROWDED mean?

OVERCROWDED verb
  1. To fill beyond reasonable limits, with people, animals, objects or information.
OVERCROWDED adjective
  1. Containing too many occupants for an area of its size.

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