Artist's piecework (7)

I believe the answer is:

collage

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'artist's piecework' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

This is the entire clue.

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(Other definitions for collage that I've seen before include "Stuck-on art form" , "Artwork from sundry stuck-on items" , "Art form using pieces stuck on" , "Composition made by fixing pieces to a surface" , "Pictures made by sticking together pieces of paper etc." .)

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

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