I, one of those who's affected, returned ornamental art (6)

I believe the answer is:

bonsai

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'art' is the definition.
(I know that bonsai is a art)

I can't explain the rest of the clue.

(Other definitions for bonsai that I've seen before include "Japanese plant or tree grown in miniature form" , "Japanese art of growing dwarf trees" , "Tree dwarfing art" , "Little plants" , "Dwarf tree found in Bosnia" .)

I've seen this clue in The Times.

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