Cryptic crossword clue
Constrain outings of aeronautical speeds  9

The most common and most likely answer to this crossword clue is the 9 letter word TRANSONIC

T
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A
N
S
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C

Buddy explains!

The straight part
We know that "aeronautical speeds" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case aeronautical speeds = transonic.
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 TRANSONIC mean?

TRANSONIC adjective
  1. Just below, or just above the speed of sound (0.8 < Ma < 1.2 approximately).
  2. Passing from subsonic to supersonic, or vice versa.

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