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Assume he's a cross-country runner (3)

Ross

I believe the answer is:

don

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

I believe this clue is a triple definition!

'assume' is the first definition.
(I know that assume can be written as don)

'he's' is the second definition.

'a cross-country runner' is the third definition.
'Don' can be an answer for 'runner' (Yorkshire river). I'm not certain of the 'a cross-country' bit.

Can you help me to learn more?

(Other definitions for don that I've seen before include "Get into" , "Member of university" , "Bradman, the ---" , "Put on the learned man" , "Lecturer, Mafia chief and Spanish aristocrat" .)

I've seen this clue in the Evening Standard.
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