Cryptic crossword clue
Something found in each radioactive element 8

The most common and most likely answer to this crossword clue is the 8 letter word ACTINIUM

I've seen this crossword clue in Financial Times
A
C
T
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 = actinium.
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 ACTINIUM mean?

ACTINIUM noun
  1. A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores

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