The most common and most likely answer to this crossword clue is the 7 letter word TRITONE
I've seen this crossword clue in Financial Times
T
R
I
T
O
N
E
More clues leading to the result TRITONE
- Musical interval: tenor struggles with it
- Interval for players performing in dull setting
- Interval in concert hall? Fashionable crowd have to attempt old-style circulating
- Vocal campaign to prosecute Blair coming after a long interval?
- Performing in dull musical interval
- Having skipped first half, Whynot turns up in exciting ‘Rite’ interval
Buddy explains!
The straight part
We know that "a long interval" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a long interval = tritone.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 TRITONE mean?
TRITONE noun- An interval of three whole tones.