Cryptic crossword clue
Riding on rocks, kept in shape by pressure only 3-5

The most common and most likely answer to this crossword clue is the 9 letter word NON-RIGID

I've seen this crossword clue in The Guardian
N
O
N
-
R
I
G
I
D


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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 NON-RIGID mean?

NON-RIGID adjective
  1. Not rigid; flexible
  2. (of an airship) That maintains its shape only by internal gas pressure

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