Crossword Genius

Artistic piecework (6)

Ross

I believe the answer is:

mosaic

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'artistic piecework' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

This is the entire clue.

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(Other definitions for mosaic that I've seen before include "Tessellated design" , "Decorative work of small hard pieces" , "from one of the prophets" , "Pattern of small stones" , "Inlaid work - of a Hebrew prophet" .)

I've seen this clue in The Globe and Mail.
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