Crossword Genius

Supporter of the railways? (7)

Ross

I believe the answer is:

sleeper

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

This is the entire clue.

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(Other definitions for sleeper that I've seen before include "Rail supporter; secret agent" , "Supportive log on railway track" , "Brace to support rail on track" , "latent spy" , "Wagon-lit" .)

I've seen this clue in The Mirror.
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