Cryptic crossword clue
In true fashion raised an issue — but they are so small 9

The most common and most likely answer to this crossword clue is the 9 letter word NEUTRINOS

N
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Buddy explains!

The straight part
We know that "they are so small" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they are so small = neutrinos.
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 NEUTRINOS mean?

NEUTRINOS noun
  1. An elementary particle that is classified as a lepton, and has an extremely small but nonzero mass and no electric charge. It interacts with the surroundings only via the weak force or gravitation, making it very difficult to detect.

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