What does the cryptic crossword clue "Early post I sorted consisting mainly of letters (10)" 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.

Early post I sorted consisting mainly of letters (10)

Independent Cryptic #11346 | 18 Across | 2023-02-22 flower

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