Cryptic crossword clue
Identical notes about right uranium mass: it’s radioactive stuff 7

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

I've seen this crossword clue in The Times
T
R
I
T
I
U
M

Buddy explains!

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

TRITIUM noun
  1. An atom of this isotope.

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