Trend in Great Depression ruined Democrat: millions lost (3,4)

I believe the answer is:

art deco

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'trend in great depression' is the definition.
The definition suggests a singular noun which matches the answer.

'ruined democrat millions lost' is the wordplay.
'ruined' is an anagram indicator.
'millions' becomes 'm' (abbreviation).
'lost' suggests deleting specific letters.
'democrat' with 'm' taken out is 'deocrat'.
'deocrat' anagrammed gives 'ART DECO'.

Can you help me to learn more?

(Other definitions for art deco that I've seen before include "1920s and 1930s style of ornamentation" , "1920s and 1930s ornamental style" , "Aesthetic style" , "Architecture and design movement of the 1930s" , "Early C 20 style" .)

I've seen this clue in The Times.

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