Channels getting discovered for street in structures below ground? (11)

I believe the answer is:

foundations

'structures below ground?' is the definition.
(foundations of a building)

'channels getting discovered for street' is the wordplay.
I cannot quite understand how this works, but
'discovered' could be 'found' (finding is a kind of discovering) and 'found' is located in the answer.
This may be the basis of clue (or it may be nonsense).

'in' is the link.

I've seen this clue in The Times.

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