Cryptic crossword clue
Syndicate with one pound investment maturing 8

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

I've seen this crossword clue in The Times
R
I
P
E
N
I
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G

Buddy explains!

The straight part
We know that "maturing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case maturing = ripening.
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 RIPENING mean?

RIPENING verb
  1. To grow ripe; to become mature (said of grain, fruit, flowers etc.)
  2. To approach or come to perfection.
  3. To cause to mature; to make ripe
  4. To mature; to fit or prepare; to bring to perfection
RIPENING noun
  1. The process of becoming ripe.

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