Cryptic crossword clue
Breathing apparatus split in ‘alf? Poor soul 8

The most common and most likely answer to this crossword clue is the 8 letter word ALVEOLUS

I've seen this crossword clue in Financial Times
A
L
V
E
O
L
U
S

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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 ALVEOLUS mean?

ALVEOLUS noun
  1. A small cavity or pit.
  2. An anatomical structure that has the form of a hollow cavity, as:

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