Cryptic crossword clue
Where they scientifically test Corbyn’s speeches? 12

The most common and most likely answer to this crossword clue is the 12 letter word LABORATORIES

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

The straight part
We know that "Where they scientifically test" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case where they scientifically test = laboratories.
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 LABORATORIES mean?

LABORATORIES noun
  1. A room, building or institution equipped for scientific research, experimentation or analysis.
  2. A place where chemicals, drugs or microbes are prepared or manufactured.

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