Cryptic crossword clue
In bombing nine times one needing uranium, 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 Financial Times
E
I
N
S
T
E
I
N
I
U
M

Buddy explains!

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