Cryptic crossword clue
Tumultuous, sturdy support for Chuck Yeager’s debut 5-5

The most common and most likely answer to this crossword clue is the 11 letter word HURLY-BURLY

I've seen this crossword clue in Financial Times
H
U
R
L
Y
-
B
U
R
L
Y

Buddy explains!

The straight part
We know that "Tumultuous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tumultuous = hurly-burly.
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 HURLY-BURLY mean?

HURLY-BURLY noun
  1. A noisy and disorderly tumult and confusion, especially as of battle.

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