One knows a vehicle will pass through street (6)
I believe the answer is:
savant
'one knows' is the definition.
I can't judge whether this definition defines the answer.
'a vehicle will pass through street' is the wordplay.
'vehicle' becomes 'van' (type of vehicle).
'will pass through' means one lot of letters goes inside another.
'street' becomes 'st' (abbreviation).
'a'+'van'='avan'
'avan' going within 'st' is 'SAVANT'.
Can you help me to learn more?
(Other definitions for savant that I've seen before include "Scholarly person" , "Clever sort" , "A learned person, from French" , "academic" , "One of great learning" .)