Crossword Genius

Left on beach, exhausted (6-2)

Ross

I believe the answer is:

washed-up

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

I cannot understand how the remainder of the clue works.

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(Other definitions for washed-up that I've seen before include "Successful no longer" , "Done for" , "Finished" , "as restaurant's dishes should be?" .)

I've seen this clue in The Times.
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