Crossword Genius

Cross-country runner going through Paris (5)

Ross

I believe the answer is:

seine

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

'cross-country runner' is the definition.
'Seine' can be an answer for 'runner' (river in France). I'm unsure of the 'cross-country' bit.

'going through paris' is the wordplay.
I cannot quite see how this works, but
'through' could be 'in' and 'in' is located in the answer.
The remaining letters 'see' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for seine that I've seen before include "French river -- type of fishing net" , "Paris's river" , "Second longest river in France" , "Paris river" , "Parisian river" .)

I've seen this clue in the Evening Standard.
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