Crossword Genius

Such charges can be profoundly disturbing at sea (5)

Ross

I believe the answer is:

depth

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This clue could be a double definition.

'such charges can' is the first definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'profoundly disturbing at sea' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'be' is the link.

Can you help me to learn more?

(Other definitions for depth that I've seen before include "Deepness" , "Distance from top down as in water" , "Distance downwards" , "sometimes leading to charge for sailors at war?" , "Measure" .)

I've seen this clue in the Evening Standard.
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