Crossword Genius

Unknown treasure guide? (1,5,3,4)

Ross

I believe the answer is:

x marks the spot

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If this is the answer I cannot explain how the clue works.

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(Other definitions for x marks the spot that I've seen before include "Find reference" , "where I kissed you!" , "That's where you'll find the buried treasure!" , "Show me exactly" , "meeting description of 8/10 - with 20d" .)

I've seen this clue in The Guardian.
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