E.g. dim stretch of road in Hammersmith? (7)

I believe the answer is:

flyover

'stretch of road in hammersmith?' is the definition.
(Hammersmith flyover is a road in London)

I cannot understand how the rest of the clue works.

(Other definitions for flyover that I've seen before include "part of highway?" , "The High Road" , "Road bridging another" , "Raised road" , "Road or rail bridge" .)

I've seen this clue in The Independent.

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