Like the Parthenon's columns (5)
I believe the answer is:
doric
'like the parthenon's columns' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for doric that I've seen before include "Classical building style" , "One classical order in architecture" , "Type of column" , "A classical style of architecture with fluted columns" , "In a classical Greek style of architecture" .)