Crossword Genius

Nothing in rejected account is private (7)

Ross

I believe the answer is:

trooper

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

This clue could be a double definition.

'nothing in rejected account' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'private' is the second definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'is' is the link.

Can you help me to learn more?

(Other definitions for trooper that I've seen before include "Proverbially swearing soldier" , "Cavalry soldier" , "Soldier, proverbial swearer" , "Cavalryman" , "ship" .)

I've seen this clue in The Telegraph.
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