The most common and most likely answer to this crossword clue is the 9 letter word ALTIMETER
I've seen this crossword clue in The Sunday Telegraph
A
L
T
I
M
E
T
E
R
More clues leading to the result ALTIMETER
- Change round hour and position indicator
- Change round what may be shown on dial for cockpit instrument
- Switch around raised vent in measuring instrument
- Aerospace technology to change with intervention of several years?
- Aero instrument adjusted rate divided by duration?
- Issue raised during change in device measuring height
- Moment to change clothes for bit of pilot’s kit
- Change round hours and minutes perhaps in measuring instrument
- Change over years, say, in flying instrument
- Instrument provides change within the hour? On the contrary
Buddy explains!
The straight part
We know that "flying instrument" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flying instrument = altimeter.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 ALTIMETER mean?
ALTIMETER noun- An apparatus for measuring altitude.