Situation: You have asked someone for the time but don't quite understand their answer. You think they said that it was one o'clock, but you are not sure. Ask him/her again if it is one o'clock.
Interpretation of the utterance: Reiterative yes-no question
Informator: M. T.
Utterance: L'es una ora?
Translation: It's one o'clock?
[It's one hour?]