Street vehicle’s maximum distance of travel is unusual (7)
I believe the answer is:
strange
'unusual' is the definition.
(I know that unusual can be written as strange)
'street vehicle's maximum distance of travel' is the wordplay.
I cannot really understand how this works, but
'street' could be 'st' (abbreviation) and 'st' is found in the answer.
'distance' could be 'range' (I've seen this in another clue) and 'range' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for strange that I've seen before include "as quarks in certain hadrons" , "Weird, eerie" , "Unknown or peculiar" , "Different" , "Surreal" .)