Possible Clues:

• Did one divine the sound of one that's staying?
• Hazarded, estimated
• Reckoned, judged
• I'm told visitor was a speculator
• How the one that's staying, by the sound of it, got the answer
• How one got the answer to the one that's staying, by the sound of it
• A resident may be heard, it's surmised
• Sound visitor, so it's thought
• How one might have divined that one is not a resident, by the sound of it
• Reckoned hotel client could be heard