Group chats cannot be deleted in Cliq, but you can delete the conversations for yourself.
Note: The entire conversation will still be available for the other group members to see.You can follow the steps below to clear the chat history in Cliq.
Click History from the navigation sidebar.
In Conversations, click on the chat you want clear.
Click the Kebab icon (three dots) in the top-right corner of the chat and select Clear Chat.
Click Delete in the confirmation pop-up window to clear the chat.

Note: Once you clear chat history, the action is permanent and cannot be undone.