The most common and most likely answer to this crossword clue is the 8 plus 1 letter word NIRVANA} –
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Buddy explains!
The straight part
We know that "sheer bliss" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sheer bliss = nirvana} –.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 NIRVANA} – mean?
NIRVANA} – noun- Complete cessation of suffering; a blissful state attained through realization of sunyata; enlightened experience.
- (non-Buddhist) State of paradise; heightened or great pleasure.