Cryptic crossword clue
Revised format of speech therapy, missing the extra dimension 10

The most common and most likely answer to this crossword clue is the 10 letter word HYPERSPACE

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

The straight part
We know that "extra dimension" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case extra dimension = hyperspace.
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 HYPERSPACE mean?

HYPERSPACE noun
  1. An n-dimensional Euclidian space with n > 3.
  2. A Euclidian space of unspecified dimension.
  3. A notional space orthogonal to the usual dimensions of space-time often used for faster-than-light travel.
HYPERSPACE verb
  1. To travel or transport into hyperspace.

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