Cryptic crossword clue
How we can speak in a stupid way when mother’s out 13

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

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

The straight part
We know that "How we can speak/ How we can speak" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case how we can speak/ how we can speak = idiomatically.
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.

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