Crossword Genius

Ancient Gaul's cut by daggers (5)

Ross

I believe the answer is:

obeli

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

I don't understand how the rest of the clue works.

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(Other definitions for obeli that I've seen before include "Textual indicators" , "Dagger signs for footnotes" , "Little daggers" , "Signs referring to footnotes" , "Printers' marks; be oil (anag.)" .)

I've seen this clue in The Independent.
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