Roof designed in the new mode (4)
I believe the answer is:
'roof designed in' is the definition.
'dome' can be an answer for 'roof' (I have seen 'Hemispherical roof ' mean 'dome' so perhaps 'roof' could also mean 'dome'). I am unsure of the 'designed in' bit.
'new mode' is the wordplay.
'new' indicates anagramming the letters.
'mode' anagrammed gives 'DOME'.
'the' is the link.
Can you help me to learn more?
(Other definitions for dome that I've seen before include "Curved roof" , "Hemispherical structure" , "Mode or arched roof" , "Rounded roof with circular base" , "Crown" .)