Cryptic crossword clue
Celestial fire’s fuel in rising star 8

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

I've seen this crossword clue in The Times
E
M
P
Y
R
E
A
N

Buddy explains!

The straight part
We know that "Celestial" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case celestial = empyrean.
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 EMPYREAN mean?

EMPYREAN noun
  1. The region of pure light and fire; the highest heaven, where the pure element of fire was supposed by the ancients to exist: the same as the ether, the ninth heaven according to ancient astronomy.
EMPYREAN adjective
  1. Of the sky or the heavens; celestially refined.

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