Cryptic crossword clue
Transport system invented by a one-track mind? 8

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

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Transport system invented by a one-track mind" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case transport system invented by a one-track mind = monorail.
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 MONORAIL mean?

MONORAIL noun
  1. A railroad system where the trains run on one rail
  2. A train running on a single rail

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