Deposited on the shore - or on the rocks (6,2)

I believe the answer is:

washed up

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'deposited' is the definition.
Although both the answer and definition are past participle verbs, I can't understand how they can define each other.

I can't explain the rest of the clue.

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(Other definitions for washed up that I've seen before include "Did kitchen duty" , "Thrown on shore; did dishes" , "Defeated or failed - left on shore? (6, 2)" , "Done for - cleaned dishes" , "Defeated, failed - or cleaned dishes" .)

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

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