Cryptic crossword clue
One gets to slide during sleep? It’s most hazardous 8

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

I've seen this crossword clue in The Daily Telegraph
R
I
S
K
I
E
S
T

Buddy explains!

The straight part
We know that "most hazardous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most hazardous = riskiest.
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 RISKIEST mean?

RISKIEST adjective
  1. Dangerous, involving risks.

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