Did initially request a piece of advice, turning up a large book (3,7)

'book' is the definition.
(book by Karl Marx)

'did initially request a piece of advice turning up a large' is the wordplay.
'initially' indicates taking the first letters.
'request' becomes 'ask' (synonyms).
'piece of advice' becomes 'tip' (I've seen this before).
'turning up' shows that the letters should be reversed in order.
'a large' becomes 'al' (I've seen this in other clues).
The first letter of 'did' is 'd'.
'tip' written backwards gives 'pit'.
'd'+'ask'+'a'+'pit'+'al'='DAS KAPITAL'