Cryptic crossword clue
Stone found in remarkably robust planes 9

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

I've seen this crossword clue in The Guardian
T
U
R
B
O
J
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T
S

Buddy explains!

The straight part
We know that "planes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case planes = turbojets.
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 TURBOJETS mean?

TURBOJETS noun
  1. A jet engine that develops thrust solely from high-speed exhaust gases expelled from a turbine that drives a compressor.

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