Crossword Genius

Obsolete truck out a kilometre on backstreet blocks? (9)

Ross

I believe the answer is:

obstructs

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'blocks?' is the definition.
('obstruct' can be a synonym of 'block')

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for obstructs that I've seen before include "Prevents or hinders passage" , "Blocks" .)

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