Crossword Genius

Track missing its opening bar (4)

Ross

I believe the answer is:

rail

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

This might be a double definition.

'track missing its opening' is the first definition.
I know that 'track' relates to this answer.

'bar' is the second definition.
(I know that rail is a type of bar)

Can you help me to learn more?

(Other definitions for rail that I've seen before include "Bar or banister" , "Track - complain - bird" , "Part of train track" , "Kind of transport" , "Water bird; barrier" .)

I've seen this clue in The Sunday Times.
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