Cryptic crossword clue
Unassailable study about being on the move 4-4

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

I've seen this crossword clue in The Guardian
C
A
S
T
-
I
R
O
N


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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 CAST-IRON mean?

CAST-IRON noun
  1. A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould.
CAST-IRON adjective
  1. Made of cast iron.
  2. Durable; tough; resiliant.
  3. Inflexible or without exception.

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