Cryptic crossword clue
Metal layer, one with unusual casing 7

The most common and most likely answer to this crossword clue is the 7 letter word RHENIUM

I've seen this crossword clue in Financial Times
R
H
E
N
I
U
M

Buddy explains!

The straight part
We know that "Metal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case metal = rhenium.
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 RHENIUM mean?

RHENIUM noun
  1. A metallic chemical element (symbol Re) with an atomic number of 75: a heavy, silvery-gray transition metal.
  2. A single atom of this element.

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