Cryptic crossword clue
Showing unusual maturity, but lacking a certain element 7

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

I've seen this crossword clue in Financial Times
Y
T
T
R
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 YTTRIUM mean?

YTTRIUM noun
  1. A silvery metallic chemical element (symbol Y) with an atomic number of 39, mainly found in combination with lanthanide elements in rare-earth minerals.

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