Cryptic crossword clue
Arguably more mature worker is source of corruption 10

The most common and most likely answer to this crossword clue is the 10 letter word ADULTERANT

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "source of corruption" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case source of corruption = adulterant.
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 ADULTERANT mean?

ADULTERANT noun
  1. That which adulterates, or reduces the purity of something.

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