Cryptic crossword clue
Change layout in part of theatre for matinee 8

The most common and most likely answer to this crossword clue is the 8 letter word REFORMAT

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

The straight part
We know that "Change layout" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case change layout = reformat.
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 REFORMAT mean?

REFORMAT verb
  1. To format anew or again, generally erasing a previous format.

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