Crossword Genius

Scottish cross-country runner (3)

Ross

I believe the answer is:

tay

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

'runner' is the definition.
(Scottish river)

'scottish cross-country' is the wordplay.
I cannot really see how this works, but
'cross' could be 't' (shape) and 't' is present in the answer.
The remaining letters 'ay' 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 tay that I've seen before include "Wicklow lake" , "Scotland's longest river" , "Dundee's river" , "Longest Scottish river" , "Longest river of Scotland" .)

I've seen this clue in the Evening Standard.
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