Like buildings to be circular at the ground (13)
I believe the answer is:
architectural
'like buildings to' is the definition.
I can't tell whether this defines the answer.
'circular at the ground' is the wordplay.
'ground' indicates anagramming the letters ('grind' the letters into a new form).
'circular'+'at'+'the'='circularatthe'
'circularatthe' anagrammed gives 'ARCHITECTURAL'.
'be' acts as a link.
Can you help me to learn more?
(Other definitions for architectural that I've seen before include "linked to building" , "Planning some construction" , "Relating to building design" , "Pertaining to the design of buildings" .)