A scrappy sort of picture (7)

I believe the answer is:

collage

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'sort of picture' is the definition.
(I know that collage is a type of icon)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for collage that I've seen before include "Art form using glued pieces" , "Pictures made by sticking together pieces of paper etc." , "Paste-up" , "Stuck-on art form" , "Artwork formed from scraps of paper, photos etc" .)

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

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