Crossword Genius

And a gentleman? (7)

Ross

I believe the answer is:

officer

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

'gentleman?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for officer that I've seen before include "Commissioned member of the services" , "Policeman (or other authority)" , "Policeman/policewoman" , "Holder of responsible position" , "General, for example" .)

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