Crossword Genius

An old bag in a carriage (9)

Ross

I believe the answer is:

gladstone

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

'bag in a carriage' is the definition.
'Gladstone' can be an answer for 'bag' (Gladstone is an example). I'm not certain of the 'in a carriage' bit.

'an old' is the wordplay.
I cannot really see how this works, but
'an' could be 'one' and 'one' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for gladstone that I've seen before include "Politician" , "Old English P.M. or a doctor's bag" , "19th-century prime minister" , "Former British prime minister and large travelling bag" , "Victorian GOM" .)

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