The most common and most likely answer to this crossword clue is the 8 letter word PEARLITE
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The straight part
We know that "Something plated" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case something plated = pearlite.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 PEARLITE mean?
PEARLITE noun- A two-phased lamellar structure composed of alternating layers of alpha ferrite and cementite that occurs in some steels and cast irons, having a pearlescent appearance.
- An amorphous volcanic glass formed by the hydration of obsidian.
- The lightweight insulating material and aggregate resulting from expanding perlite glass by heat.