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

I believe the answer is:

street

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'road by which one can leave trieste possibly' is the definition.
'street' can be an answer for 'road' (street is a kind of road). I'm unsure of the rest of the definition.

'road by which one can leave trieste' is the wordplay.
'road' becomes 'st'.
'by which' means one lot of letters go next to another.
'one can' becomes 'ree' (I can't justify this - if you can you should give a lot more credence to this answer).
'leave' suggests taking the first letters (I've seen 'left of' mean this (the leftmost letter in the word)).
The initial letter of 'trieste' is 't'.
'st'+'ree'+'t'='STREET'

Can you help me to learn more?

(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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