The most common and most likely answer to this crossword clue is the 6 letter word EIGHTH
E
I
G
H
T
H
More clues leading to the result EIGHTH
- The last Edward's stature, first, to last
- High tone on being released tremolo in octave
- Describing position of summit, beginning to end
- 12.5% extra wonder
- Bobsleigh that’s out of the medals?
- Fraction of distance from head to foot, top to toe
- Rowing crew beginning to hurry just a fraction
- Description of Tudor monarch‘s interval of twelve semitones
- Top of peak down to base — some way down?
- Team rowing hard, last in quarter-final?
Buddy explains!

The straight part
We know that "octave" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case octave = eighth.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 EIGHTH mean?
EIGHTH noun- The person or thing in the eighth position.
- One of eight equal parts of a whole.
- An eighth of an ounce, or approximately 3.5 grams, of marijuana or other drugs.
- To divide by eight
- The ordinal form of the number eight.