Cryptic crossword clue
A new little extra thing? It was once that to a physicist 12

The most common and most likely answer to this crossword clue is the 12 letter word ANTIPARTICLE

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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 ANTIPARTICLE mean?

ANTIPARTICLE noun
  1. A subatomic particle corresponding to another particle with the same mass, spin and mean lifetime but with charge, parity, strangeness and other quantum numbers flipped in sign; a particle that has a reversed world line to another.

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