Cryptic crossword clue
Agency to make something happen when a country lassenters London? no fool

The most common and most likely answer to this crossword clue is the 9 letter word CAUSALITY

I've seen this crossword clue in The Guardian
C
A
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S
A
L
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Y

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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.
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What does CAUSALITY mean?

CAUSALITY noun
  1. The agency of a cause; the action or power of a cause, in producing its effect.
  2. The relationship between something that happens or exists and the thing that causes it; the cause and consequence relationship.

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