Show to be false way to wake sailor! (6)

I believe the answer is:

debunk

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'show to be false' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for debunk that I've seen before include "Expose pretensions of" , "Show to be exaggerated or false, claim or theory" , "Disprove" , "Show to be falsely honoured" , "Expose false claims" .)

I've seen this clue in the Sydney Morning Herald.

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