Crossword Genius

Blade worn needs edges switched (6)

Ross

I believe the answer is:

dagger

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'blade' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for dagger that I've seen before include "Murder weapon" , "Stabbing weapon" , "Hand weapon" , "Short knife for stabbing" , "''Is this a ... which I see before me'' (Macbeth)" .)

I've seen this clue in The Sun.
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