Crossword Genius

She remains a long-distance specialist (6)

Ross

I believe the answer is:

stayer

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This clue could be a double definition.

'she remains' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'a long-distance specialist' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

Can you help me to learn more?

(Other definitions for stayer that I've seen before include "One not easily giving up" , "One with stamina" , "One with lasting qualities" , "Persistent person" , "Person who lasts the course, doesn't quit" .)

I've seen this clue in the Sydney Morning Herald.
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