What does the cryptic crossword clue "Periodically using 8 is key, for example (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.

Periodically using 8 is key, for example (4)

Guardian Cryptic #29551 | 26 Across | 2024-11-27

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