Crossword Genius

In Paris, 1 + 1 + 1/3 of 2 = 1? (4)

Ross

I believe the answer is:

unit

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I believe this is a quadruple definition!!

'in paris 1' is the first definition.
'unit' can be an answer for '1' (synonyms). I am unsure of the 'in paris' bit.

'1' is the second definition.
(synonyms)

'13 of 2' is the third definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'1?' is the fourth definition.
(synonyms)

Can you help me to learn more?

(Other definitions for unit that I've seen before include "Single undivided whole" , "Single thing or person" , "Army division" , "Separate part" , "Item combining separate parts" .)

I've seen this clue in The Guardian.
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