What does the cryptic crossword clue "By which to read chart left by a member? (5,4)" 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.

By which to read chart left by a member? (5,4)

Guardian Cryptic #28610 | 15 Down | 2021-11-23 flower

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