Crossword Genius

Did sink stand up on flat surface? (5)

Ross

I believe the answer is:

ebbed

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'did' is the definition.
The definition and answer can be both to do with motion as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ebbed that I've seen before include "Flowed back or receded" , "Diminished" , "Went out like tide" .)

I've seen this clue in The Telegraph.
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