For those of you who are using the latest version of Clockwork, there is a bug where whenever a character uses the /radio command, "ChatPlayerRadio" appears on every player's chatbox. I've created a pull request to fix this for people who will download the framework in the future, but for those of you who are running servers using CW 0.99, you're going to want to do the following:
garrysmod/gamemodes/clockwork/framework/libraries/client/ and open
cl_chatbox.lua. Then, go to line
1257 and add an
s to the
ChatPlayerRadio. That should fix the problem, as far as I am aware.
If it doesn't, please let me know.