Crossword Genius

Port’s initially like Erith but without river (5)

Ross

I believe the answer is:

leith

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'port's' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for leith that I've seen before include "Scottish port" , "Port of Edinburgh" .)

I've seen this clue in The Times.
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