Crossword Genius

Lehman's went to this rich Manhattan street (4)

Ross

I believe the answer is:

wall

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'street' is the definition.
(Wall Street is an example)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for wall that I've seen before include "Brick construction" , "Brick or stone barrier" , "Side of building/room" , "Solid barrier" , "Solid partition" .)

I've seen this clue in The Sun.
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