Crossword Genius

Bar on a flight (5,3)

Ross

I believe the answer is:

stair rod

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

'bar' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?

'flight' is the wordplay.
I cannot really understand how this works, but
'flight' could be 'stair' (I've seen this before) and 'stair' is found in the answer.
The remaining letters 'rod' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'on a' acts as a link.

Can you help me to learn more?

(Other definitions for stair rod that I've seen before include "Fixture between riser and treader" , "Fixture on flight" , "Securer for carpet" , "seeming to come down in heavy rain" , "As torrid (anag.)" .)

I've seen this clue in The Guardian and The Globe and Mail.
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