Crossword Genius

Period of maritime decline (3)

Ross

I believe the answer is:

ebb

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'decline' is the definition.
(I know that ebb is a type of decline)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for ebb that I've seen before include "Receding movement, as of a tide" , "recession" , "state of decline" , "Type of tide" , "(Of tidewater) recede" .)

I've seen this clue in The Globe and Mail.
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