The most common and most likely answer to this crossword clue is the 6 letter word OCTAVE
I've seen this crossword clue in The Guardian
O
C
T
A
V
E
More clues leading to the result OCTAVE
- Future Emperor trades Scotsman for English series of notes
- Overact manically: spectator finally bailing in interval
- Eight days or weeks with hail
- Interval of time in old grotto
- Old church keeps back wine aplenty for duration of festival
- Group of eight taking time in old grotto
- Eight-day event in autumn month on avenue
- Green welcoming tax rises in fixed interval
- Concoct a verse containing series of notes
- English tax firm returns set of 8
Buddy explains!
The straight part
We know that "fixed interval" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fixed interval = octave.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 OCTAVE mean?
OCTAVE noun- An interval of twelve semitones spanning eight degrees of the diatonic scale, representing a doubling or halving in pitch frequency.
- The pitch an octave higher than a given pitch.
- A coupler on an organ which allows the organist to sound the note an octave above the note of the key pressed (cf sub-octave)
- A poetic stanza consisting of eight lines; usually used as one part of a sonnet.
- The eighth defensive position, with the sword hand held at waist height, and the tip of the sword out straight at knee level.
- The day that is one week after a feast day in the Latin rite of the Catholic Church.
- An eight-day period beginning on a feast day in the Latin rite of the Catholic Church.
- An octonion.
- Any of a number of coherent-noise functions of differing frequency that are added together to form Perlin noise.
- The subjective vibration of a planet.
- Consisting of eight; eight in number.