Cryptic crossword clue
Old queen calming undisciplined bombast 13

The most common and most likely answer to this crossword clue is the 13 letter word MAGNILOQUENCE

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

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

MAGNILOQUENCE noun
  1. The quality of being magniloquent; pompous discourse.

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