Crossword Genius

Her trench is covered in water (7)

Ross

I believe the answer is:

mariana

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'her' is the definition.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for mariana that I've seen before include "- in the Moated Grange (Tennyson/Millais)" , "------- Trench, the deepest part of the Earth's oceans" .)

I've seen this clue in The Irish Times.
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