Cryptic crossword clue
Around x-ray, notice strange energy concentration 7

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

I've seen this crossword clue in The Times
E
X
C
I
T
O
N

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The straight part
We know that "energy concentration" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case energy concentration = exciton.
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 EXCITON mean?

EXCITON noun
  1. A bound state of an electron and an electron hole in an insulator or semiconductor

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