Cryptic crossword clue
Not interested in a course, along with other things one introduced 9

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

I've seen this crossword clue in The Times
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The straight part
We know that "Not interested in" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not interested in = apathetic.
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 APATHETIC mean?

APATHETIC adjective
  1. Void of feeling; not susceptible of deep emotion
  2. Of, or pertaining to apatheism.

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