What does the cryptic crossword clue "Difficult second book (8)" mean?

The definition is "book". The wordplay uses a charade (building blocks). HARD (synonym of "Difficult") + BACK (synonym of "second"); definition: "book" The answer is Hardback.

Difficult second book (8)

Telegraph Prize Cryptic #3081 | 17 Down | 2020-11-08 flower

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