Crossword Genius

Where sailors may be almost out of earshot, somehow (6)

Ross

I believe the answer is:

ashore

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'where' is the definition.
Both the answer and definition are adverbs. Perhaps they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

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(Other definitions for ashore that I've seen before include "Hoarse (anag)" , "in port?" , "Hoarse being no longer at sea" , "On land (as opposed to the sea)" , "On(to) dry land" .)

I've seen this clue in the Evening Standard.
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