The most common and most likely answer to this crossword clue is the 8 letter word ADDUCING
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Buddy explains!

The straight part
We know that "Quoting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case quoting = adducing.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 ADDUCING mean?
ADDUCING verb- To bring forward or offer, as an argument, passage, or consideration which bears on a statement or case; to cite; to allege.