Highest level of architecture? (4)
I believe the answer is:
roof
'architecture?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'highest level of' is the wordplay.
'highest level' becomes 'ro' (I am not sure about this - if you are sure you should believe this answer much more).
'ro'+'of'='ROOF'
Can you help me to learn more?
(Other definitions for roof that I've seen before include "See 24" , "Cover for house" , "House's top" , "Canopy" , "Top of car/house" .)