Old local was one of the people River Song met after disembarking from a steamer on her way to the Surene tomb. (AUDIO: The Boundless Sea)
Behind the scenes
Aaron Neil is not credited for this role but says in the CD Extras for box set The Diary of River Song Series One that he plays it. As there are several voices of locals audible at the port, this information is not sufficient to determine exactly which of them is played by Neil.