Crossword Genius

Unorthodox, like Humpty-Dumpty's end? (3,3,4)

Ross

I believe the answer is:

off the wall

'unorthodox' is the definition.

I don't understand the rest of the clue.

(Other definitions for off the wall that I've seen before include "Grossly unconventional" , "American eccentric" , "how Humpty Dumpty ended up" , "Left field" , "description of peeling plaster?" .)

I've seen this clue in The Guardian.
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