Crossword Genius

Just the sword for a dance (5)

Ross

I believe the answer is:

sabre

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'dance' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for sabre that I've seen before include "Type of sword" , "Sword (that may be rattled)" , "Sword with curved blade" , "weapon" , "Walt --, cartoonist" .)

I've seen this clue in the Evening Standard.
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