Crossword Genius

Wherein one was unconscious of travelling in luxury? (7)

Ross

I believe the answer is:

pullman

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

'unconscious of travelling in luxury?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'wherein one' is the wordplay.
I cannot really see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found within the answer.
This explanation may well be incorrect...

'was' acts as a link.

Can you help me to learn more?

(Other definitions for pullman that I've seen before include "Luxury railway carriage" , "Luxurious style of railway carriage" , "luxury car" , "Philip --, novelist" .)

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