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

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

Tough second book (8)

Telegraph Prize Cryptic #3111 | 16 Down | 2021-06-06 flower

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