Leaving a clan on RS Mobile follows the same procedure as leaving a clan through the client with one extra step.
First, you need to access the Community icons by tapping the icon that appears as two people (one in green, and one in orange) in your chat box. Next, open the Clan Chat tab by tapping on the yellow Clan icon on the right side of your screen. From there, click the 'Leave clan' button at the bottom of your Clan Chat tab.
Hope this helps
How to open Clan Chat on Mobile:
How to leave Clan: (the icon at the bottom is the same on Mobile)
~ Sicariu
Leader of