The most common and most likely answer to this crossword clue is the 8 letter word WINDPIPE
I've seen this crossword clue in The Guardian
W
I
N
D
P
I
P
E
More clues leading to the result WINDPIPE
- Passage in port, say, entered by Dee and Philip
- Personal airline?
- Victory — before Germany just beat European airline
- Airline wiped PIN in error
- Turn to go down to Tube — one should take in the air
- Means of breathing has turn on Tube
- Section of orchestra to play passage
- Blow whistle for a breathing space
- Blow whistle in passage
Buddy explains!

The straight part
We know that "Personal airline?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case personal airline? = windpipe.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 WINDPIPE mean?
WINDPIPE noun- The trachea.
- Any duct for air or other gas.
- A section of road or bridleway which has a reputation for having strong crosswinds or localized wind swirls.
- The anus.