The most common and most likely answer to this crossword clue is the 5 letter word CITES
I've seen this crossword clue in The Daily Telegraph
C
I
T
E
S
More clues leading to the result CITES
Buddy explains!

The straight part
We know that "Quotes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case quotes = cites.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 CITES mean?
CITES verb- To quote; to repeat, as a passage from a book, or the words of another.
- To list the source(s) from which one took information, words or literary or verbal context.
- To summon officially or authoritatively to appear in court.
- A citation