Double curve that is to lead back in less important ways (11)

I believe the answer is:

sidestreets

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'double curve that is to lead back' is the definition.
I know nothing about this answer so I can't judge whether this works.

'less important ways' is the wordplay.
'less important' becomes 'side' (I am not sure about this - if you are sure you should believe this answer much more).
'ways' becomes 'streets' (street is a kind of way).
'side'+'streets'='SIDESTREETS'

'in' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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