The most common and most likely answer to this crossword clue is the 4 plus 2 plus 6 plus 4 letter word PUCK OF POOK’S HILL
I've seen this crossword clue in The Guardian
P
U
C
K
O
F
P
O
O
K
â
€
™
S
H
I
L
L
Buddy explains!
The straight part
We know that "a book" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a book = puck of pook’s hill.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.