What does the cryptic crossword clue "Instructed to include seal to prevent entry (8)" 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.

Instructed to include seal to prevent entry (8)

Guardian Cryptic #28579 | 16 Down | 2021-10-18 flower

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