What does the cryptic crossword clue "Deep-sea swimming, both directions, for sunken gem (4,5)" 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.

Deep-sea swimming, both directions, for sunken gem (4,5)

Guardian Cryptic #29778 | 25 Across | 2025-08-20

Generating...

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

DEEP-SEA* + R (right and left)

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