Jabber in French! (4)

I believe the answer is:

epee

I'm a little stuck... Click here to teach me more about this clue!

'jabber in french' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

This is all the clue.

Can you help me to learn more?

(Other definitions for epee that I've seen before include "Fencing sword similar to a foil" , "Thin fencing sword" , "Use it to fence" , "Bit of fencing" , "Fencer's weapon" .)

I've seen this clue in the Evening Standard.

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