Cryptic crossword clue
More brilliant lights reflected in European river 5

The most common and most likely answer to this crossword clue is the 5 letter word NOVAE

N
O
V
A
E

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The straight part
We know that "More brilliant lights" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more brilliant lights = novae.
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 NOVAE mean?

NOVAE noun
  1. Any sudden brightening of a previously inconspicuous star.

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