Cryptic crossword clue
Beat restricting America, one opposing sense, finally producing an effect? 9

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

I've seen this crossword clue in Financial Times
C
A
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Buddy explains!

The straight part
We know that "producing an effect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case producing an effect = causative.
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 CAUSATIVE mean?

CAUSATIVE noun
  1. An expression of an agent causing or forcing a patient to perform an action (or to be in a certain condition).
CAUSATIVE adjective
  1. Acting as a cause
  2. Expressing a cause or causation

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