Design put Berlin off the wall (9)
I believe the answer is:
blueprint
'the wall' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'design put berlin' is the wordplay.
'design' indicates anagramming the letters.
'put'+'berlin'='putberlin'
'putberlin' with letters rearranged gives 'BLUEPRINT'.
'off' acts as a link.
Can you help me to learn more?
(Other definitions for blueprint that I've seen before include "Design or guide for making something" , "Original design" , "Formula" , "Prototype" , "Design plan" .)