What does the cryptic crossword clue "Ruth uses a different reference book (9)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Ruth uses a different reference book (9)

Daily Mail Cryptic #16435 | 4 Down | 2020-10-29 flower

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Also seen in

Daily Mail Cryptic #16266 (2020-03-06) Guardian Cryptic #23996 (2007-02-09)