What does the cryptic crossword clue "Professional rules once of doc working with channel (4,2,7)" 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.

Professional rules once of doc working with channel (4,2,7)

Daily Mail Cryptic #17438 | 15 Across | 2024-09-04

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