The most common and most likely answer to this crossword clue is the 9 letter word EXCERPTED
I've seen this crossword clue in The Sunday Telegraph
E
X
C
E
R
P
T
E
D
Buddy explains!
The straight part
We know that "Selectively quoted" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case selectively quoted = excerpted.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 EXCERPTED mean?
EXCERPTED verb- To select or copy sample material (excerpts) from a work.
- Consisting of excerpts.