Crossword Genius

Run out on the sand (6)

Ross

I believe the answer is:

desert

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'run out on' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

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(Other definitions for desert that I've seen before include "Sahara or Gobi, say" , "Uncultivated" , "Arid area of land" , "infertile land" , "an area short of water" .)

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