Unfamiliar street limits (7)
I believe the answer is:
strange
'unfamiliar' is the definition.
(synonyms)
'street limits' is the wordplay.
'street' becomes 'st' (abbreviation).
'limits' becomes 'range' (I can't explain this - if you can you should give a lot more credence to this answer).
'st'+'range'='STRANGE'
Can you help me to learn more?
(Other definitions for strange that I've seen before include "Surreal" , "- - Fruit (song)" , "Odd - rum" , "Foreign" , "Irregular" .)