A port in vulgar parlance is a shady place (6)

I believe the answer is:

arbour

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'a port' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

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

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(Other definitions for arbour that I've seen before include "Shady garden alcove" , "Shady place among trees is in garden" , "Sheltered leafy glade" , "Shady garden roofed by trees" , "'Bower, pergola (6)'" .)

I've seen this clue in The Irish News.

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