Cryptic crossword clue
Prepare clues for Everyman to begin with, Sunday lights up 10

The most common and most likely answer to this crossword clue is the 10 letter word FLUORESCES

I've seen this crossword clue in The Guardian
F
L
U
O
R
E
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S

Buddy explains!

The straight part
We know that "lights up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lights up = fluoresces.
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 FLUORESCES mean?

FLUORESCES verb
  1. To emit electromagnetic radiation, especially visible light, when absorbing radiation of some other wavelength.
  2. Of colours, to be very bright; to be so bright as to appear to radiate as a light source.

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