Cryptic crossword clue
Reason for action about America? No, it’s over 9

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

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

The straight part
We know that "Reason for action" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case reason for action = causation.
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 CAUSATION mean?

CAUSATION noun
  1. The act of causing.
  2. The act or agency by which an effect is produced.
  3. Cause and effect; causality.

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