Land in the ocean shows a narrow channel (5)

I believe the answer is:

ditch

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This might be a double definition.

'land in the ocean' is the first definition.
'ditch' can be an answer for 'land' (thesaurus). I'm unsure of the 'in the ocean' bit.

'a narrow channel' is the second definition.
(I've seen this before)

'shows' acts as a link.

Can you help me to learn more?

(Other definitions for ditch that I've seen before include "Boundary trench" , "Drainage channel" , "Type of trench" , "long depression" , "Abandon; one dug" .)

I've seen this clue in The Times.

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