The most common and most likely answer to this crossword clue is the 7 letter word DAYSTAR
D
A
Y
S
T
A
R
More clues leading to the result DAYSTAR
- Stray ad appearing originally in the Sun
- Sun always has fragmented darts coverage
- Arty ads composed for The Sun
- Sun always gets riotous darts coverage
- Info about axes reported originally in the Sun
- Sat perhaps with fixed gaze, blocking out European sun for Byron
- Sun‘s Saturday revision’s not acceptable
- The Sun, for example, omitted youth centre in Saturday's revised edition
Buddy explains!

The straight part
We know that "sun for Byron" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sun for byron = daystar.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.