Crossword Genius

Where one may be driven mad? (2,3,4)

Ross

I believe the answer is:

up the wall

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'mad?' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for up the wall that I've seen before include "Where climbers go" , "wild" , "Where espaliers run" , "Where Spiderman may go" , "Distracted, mad" .)

I've seen this clue in The Telegraph.
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