Crossword Genius

Coach line supporter (7)

Ross

I believe the answer is:

sleeper

I believe this clue is a double definition.

'coach' is the first definition.
(sleeper is a kind of coach)

'line supporter' is the second definition.
(a railway line is supported by sleepers)

(Other definitions for sleeper that I've seen before include "film not successful at first" , "Form of transport" , "Possibly ring" , "Supporting block on railway track" , "Express tears over one" .)

I've seen this clue in The Times.
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