What does the cryptic crossword clue "Requirement to enter castle tower, submerged to a certain extent (4-4)" 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.

Requirement to enter castle tower, submerged to a certain extent (4-4)

Guardian Cryptic #29752 | 10 Across | 2025-07-21 flower

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