Not a main road - it's steered round (4,6)
I believe the answer is:
side street
'not a main road' is the definition.
I can't judge whether this definition defines the answer.
'it's steered round' is the wordplay.
'round' indicates anagramming the letters.
'its'+'steered'='itssteered'
'itssteered' anagrammed gives 'SIDE STREET'.
Can you help me to learn more?
(Other definitions for side street that I've seen before include "small way" , "Minor thoroughfare" .)