Crossword Genius

One unconscious of being run over by a train (7)

Ross

I believe the answer is:

sleeper

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'train' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'one unconscious of being run over by a' is the wordplay.
'one unconscious of' becomes 'eels' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'being run over' is a reversal indicator (I've seen 'running over' mean this (the letters turn over to the opposite direction)).
'by' is a charade indicator (letters next to each other).
'a' becomes 'per' (eg 'one a day' means 'one per day').
'eels' in reverse letter order is 'slee'.
'slee'+'per'='SLEEPER'

Can you help me to learn more?

(Other definitions for sleeper that I've seen before include "Unactivated spy - railway support" , "provide on-line support?" , "Somnolent person or beam under railway track" , "One who's out" , "Form of transport" .)

I've seen this clue in the Evening Standard.
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