Cryptic crossword clue
Organised site in mine to store uranium, a radioactive element 11

The most common and most likely answer to this crossword clue is the 11 letter word EINSTEINIUM

I've seen this crossword clue in The Times
E
I
N
S
T
E
I
N
I
U
M

Buddy explains!

The straight part
We know that "a radioactive element" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a radioactive element = einsteinium.
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 EINSTEINIUM mean?

EINSTEINIUM noun
  1. A transuranic chemical element (symbol Es) with atomic number 99: a soft, silvery, paramagnetic metal.

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