Cryptic crossword clue
Serenaded girls showing viewing aids 10

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

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "viewing aids" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case viewing aids = sunglasses.
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 SUNGLASSES mean?

SUNGLASSES noun
  1. Tinted glasses worn to protect the eyes from the sun.
  2. A person wearing sunglasses

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