Crossword Genius

A timber sleeper? (3)


I believe the answer is:


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

Here is my best explanation:

This could be a double definition.

'a timber' is the first definition.

'sleeper?' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

Can you help me to learn more?

This clue was last seen in Evening Standard