Cryptic crossword clue
Island business captures old carbon in geological formation 8

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

I've seen this crossword clue in Independent
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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 ISOCLINE mean?

ISOCLINE noun
  1. A tightly folded syncline or anticline in which the two sides are almost parallel
  2. Any of a series of lines having the same slope
  3. A line on a map linking places with the same magnetic dip

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