Additionally, it means more to the French (4)

I believe the answer is:

plus

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'additionally' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for plus that I've seen before include "Together with; advantage" , "As well as" , "credit" , "The opposite of minus" , "Positive sign" .)

I've seen this clue in the Evening Standard.

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