Crossword Genius

Unconventional Olympian climbers potentially falling thus? (3,3,4)


I believe the answer is:

off the wall

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

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

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(Other definitions for off the wall that I've seen before include "Mad" , "Berliners once had to keep this" , "description of peeling plaster?" , "Grossly unconventional" , "Strange" .)

I've seen this clue in The Times.
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