Jamieson, Fausset and Brown on Titus 1:6

6. (Compare Notes, see on 1Ti 3:2-4.) The thing dwelt on here as the requisite in a bishop, is a good reputation among those over whom he is to be set. The immorality of the Cretan professors rendered this a necessary requisite in one who was to be a reprover: and their unsoundness in doctrine also made needful great steadfastness in the faith (Tit 1:9, 13).

having faithful children--that is, believing children. He who could not bring his children to faith, how shall he bring others? [Bengel]. Alford explains, "established in the faith."

not accused--not merely not riotous, but "not (even) accused of riot" ("profligacy" [Alford]; "dissolute life" [Wahl]).

unruly--insubordinate; opposed to "in subjection" (1Ti 3:4).