Cryptic crossword clue
Finally trap unstable iron particle 5

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

I've seen this crossword clue in The Daily Telegraph
P
R
I
O
N

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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 PRION mean?

PRION noun
  1. A self-propagating misfolded conformer of a protein that is responsible for a number of diseases that affect the brain and other neural tissue.
PRION noun
  1. A petrel of the genus Pachyptila.

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