Bottom line is that if you bank the wings, the airplane will eventually yaw in that direction. You can do nothing and let side-slip produce the yaw (not recommended) ...
And that yaw is the "secondary effect of roll" that you were first asking about. Good work,
A Squared.
Ok, so there is no roll during a level turn. During climbing and descending turns, however,
there has to be, and there is, ... roll! So for these manoeuvers, the aircraft is yawing, pitching and rolling.
On the climbing turn, there is roll "away" from the inside of the turn. Turning left, for example, the aircraft is rolling "right".
On the descending turn, the roll is "towards" the inside of the turn. Turning left, for example, the roll is to the "left".