The most common and most likely answer to this crossword clue is the 8 letter word DIAPASON
I've seen this crossword clue in The Guardian
D
I
A
P
A
S
O
N
More clues leading to the result DIAPASON
- Stop benefit withdrawn by two male relatives
- Stop to assist returning dad and lad
- Organ stop is sad — piano worse
- Stop sending up assistance — clergyman’s run off
- Handed money over to a child to make organ stop
- Stop playing piano? Sad
- Stop and help returning male members of family
- Stop little woman keeping a father and son pinned down
- Stop and help returning father and son
Buddy explains!
The straight part
We know that "Organ stop" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case organ stop = diapason.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 DIAPASON mean?
DIAPASON noun- The musical octave.
- (by extension) The range or scope of something, especially of notes in a scale, or of a particular musical instrument.
- A tonal grouping of the flue pipes of a pipe organ.