Cryptic crossword clue
One with common sense skirts two-thirds of railway track — potentially harmful 9

The most common and most likely answer to this crossword clue is the 9 letter word INSIDIOUS

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Buddy explains!

The straight part
We know that "potentially harmful" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case potentially harmful = insidious.
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 INSIDIOUS mean?

INSIDIOUS adjective
  1. Producing harm in a stealthy, often gradual, manner.
  2. Intending to entrap; alluring but harmful.
  3. Treacherous.

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