Road by which one can leave Trieste, possibly (6)

I believe the answer is:

street

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'road' is the definition.
(street is a kind of road)

I cannot understand how the remainder of the clue works.

(Other definitions for street that I've seen before include "Public road in a conurbation" , "See 17" , "Road lined with buildings" , "See 1 Down" , "Way < in which common man is" .)

I've seen this clue in the Evening Standard.

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