Crossword Genius

Short digital sketch? (9)

Ross

I believe the answer is:

thumbnail

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'sketch?' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for thumbnail that I've seen before include "Small sketch" , "Small image" , "computer image" , "Digital process" , "Brief or concise representation" .)

I've seen this clue in The Guardian.
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