The most common and most likely answer to this crossword clue is the 9 letter word ALPENHORN
I've seen this crossword clue in Financial Times
A
L
P
E
N
H
O
R
N
More clues leading to the result ALPENHORN
- Lengthy item calling to the lower house: planner upset about that
- Planner wild about house that’s blown up
- Aluminium enclosure to house sailors’ instrument
- Driver’s warning after a student writer finds instrument
- One left phone off before service – it produces high blasts
- It’s blown by planner altering exterior of house
- Instrument for strategic planner around house
- Instrument on plane, extremely rough in motion?
- Starts to help out navy following plane crash – it’s blown up
Buddy explains!
The straight part
We know that "instrument" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case instrument = alpenhorn.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 ALPENHORN mean?
ALPENHORN noun- A long, curved, wooden horn used by mountain-dwelling herders in the Alps, originally to call cattle but now only as musical instrument in classical and folk tunes.