Cryptic crossword clue
Two octaves support note in prime position 9

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

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

The straight part
We know that "Two octaves" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case two octaves = fifteenth.
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 FIFTEENTH mean?

FIFTEENTH noun
  1. The person or thing in the fifteenth position.
  2. One of fifteen equal parts of a whole.
  3. The interval comprising two octaves.
FIFTEENTH adjective
  1. The ordinal form of the number fifteen.

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