Not a flat-top (5)
I believe the answer is:
domed
(Other definitions for domed that I've seen before include "Vaulted" , "not flat!" , "Shaped like rounded roof" , "cupola" , "with a meniscus" .)
I believe the answer is:
domed
(Other definitions for domed that I've seen before include "Vaulted" , "not flat!" , "Shaped like rounded roof" , "cupola" , "with a meniscus" .)