Cryptic crossword clue
Did initially request a piece of advice, turning up a large book 3,7

The most common and most likely answer to this crossword clue is the 3 plus 7 letter word DAS KAPITAL

I've seen this crossword clue in The Times
D
A
S
K
A
P
I
T
A
L

Buddy explains!

The straight part
We know that "book" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case book = das kapital.
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.

Latest crossword clues with full explanations