Crossword Genius

Hail large cab (6)

Ross

I believe the answer is:

hansom

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This might be a double definition.

'hail large' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'cab' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for hansom that I've seen before include "Victorian cab" , "Two-wheeled one-horse carriage" , "Old horse cab sounds attractive" , "One-horse cab" , "transport from the old days" .)

I've seen this clue in The Hindu.
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