Cryptic crossword clue
Metal, iodine and copper blocking miners 6

The most common and most likely answer to this crossword clue is the 6 letter word INDIUM

I've seen this crossword clue in The Times
I
N
D
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 = indium.
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 INDIUM mean?

INDIUM noun
  1. A chemical element (symbol In) with an atomic number of 49: a soft silvery-white metal.
  2. A single atom of this element.

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