Cryptic crossword clue
Particle to attach firmly, we’re told 5

The most common and most likely answer to this crossword clue is the 5 letter word GLUON

I've seen this crossword clue in The Guardian
G
L
U
O
N

Buddy explains!

The straight part
We know that "Particle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case particle = gluon.
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 GLUON mean?

GLUON noun
  1. A massless gauge boson that binds quarks together to form baryons, mesons and other hadrons and is associated with the strong nuclear force.

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