The most common and most likely answer to this crossword clue is the 2 plus 3 letter word EX LIB
E
X
L
I
B
More clues leading to the result EX LIB
Buddy explains!

The straight part
We know that "From one’s shelf" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case from one’s shelf = ex lib.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.