Understand what you could do at an art auction (3,3,7)

I believe the answer is:

get the picture

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'understand' is the definition.
(I know that get the picture is a more specific form of the action the understand)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for get the picture that I've seen before include "Comprehend" , "Snap" , "Paparazzo is desperate to" , "Understand a situation" , "Grasp the situation" .)

I've seen this clue in The Telegraph.

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