Cryptic crossword clue
One’s not conscious of his progress 11

The most common and most likely answer to this crossword clue is the 11 letter word SLEEPWALKER

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

The straight part
We know that "One’s not conscious of his progress" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one’s not conscious of his progress = sleepwalker.
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.

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