What does the cryptic crossword clue "Diner must alter basic principles (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.

Diner must alter basic principles (9)

Daily Mail Cryptic #17650 | 14 Across | 2025-06-27 flower

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