Rated poor company for architectural style (3,4)
I believe the answer is:
'architectural style' is the definition.
'rated poor company' is the wordplay.
'poor' is an anagram indicator.
'company' becomes 'co' (abbreviation).
'rated' anagrammed gives 'artde'.
'for' is the link.
(Other definitions for art deco that I've seen before include "style of interior design" , "Style popular in the 1920s and '30s" , "Aesthetic style" , "Nineteen twenty's and thirties style" , "Old style" .)