The most common and most likely answer to this crossword clue is the 9 letter word GERMANIUM
I've seen this crossword clue in The Times
G
E
R
M
A
N
I
U
M
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The straight part
We know that "element" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case element = germanium.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 GERMANIUM mean?
GERMANIUM noun- A nonmetallic chemical element (symbol Ge) with an atomic number of 32: a lustrous, hard-brittle, grayish-white metalloid in the carbon group.
- An atom of this element.