The most common and most likely answer to this crossword clue is the 9 letter word HARMONIUM
I've seen this crossword clue in Financial Times
H
A
R
M
O
N
I
U
M
More clues leading to the result HARMONIUM
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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 HARMONIUM mean?
HARMONIUM noun- A small keyboard instrument that consists of a series of reed pipes, which sound when one of the keys is pressed to open a valve that allows air to pass through.