Cryptic crossword clue
Hard coat produced by processing cast iron unit 12

The most common and most likely answer to this crossword clue is the 12 letter word INCRUSTATION

I've seen this crossword clue in The Daily Telegraph
I
N
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Buddy explains!

The straight part
We know that "Hard coat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hard coat = incrustation.
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 INCRUSTATION mean?

INCRUSTATION noun
  1. The act of incrusting, or the state of being incrusted.
  2. A crust or hard coating of anything upon or within a body, as a deposit of lime, sediment, etc., from water on the inner surface of a steam boiler.
  3. A covering or inlaying of marble, mosaic, etc., attached to the masonry by cramp irons or cement.
  4. Anything inlaid or embedded.

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