Crossword Genius

Down current unseen in Egyptian port (3)

Ross

I believe the answer is:

sad

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'down' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sad that I've seen before include "Unhappy or melancholy" , "Disconsolate" , "low" , "Tragic" , "Sorrowful, unhappy" .)

I've seen this clue in The Independent and The Sun.
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