Cryptic crossword clue
Central characters in The Fifth Element 7

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

I've seen this crossword clue in Financial Times
H
A
F
N
I
U
M

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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 HAFNIUM mean?

HAFNIUM noun
  1. A chemical element (symbol Hf) with an atomic number of 72: a lustrous, silvery-grey tetravalent transition metal.

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