Chrysler Building's style (4)
I believe the answer is:
deco
'chrysler building's style' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for deco that I've seen before include "Style of design popular in the 1920s and 1930s" , "Art -, C 20 style of ornamentation" , "Art's partner" .)