Step 1. Add the below settings to the file ~/Library/Application Support/Sublime Text 3/Packages/User/Default (OSX).sublime-mousemap
[ { "button": "button1", "count": 1, "modifiers": ["ctrl"], "press_command": "drag_select", "command": "goto_definition" }, { "button": "button2", "count": 1, "modifiers": ["ctrl"], "press_command": "jump_back", "command": "jump_back" } ]
Step 2. You can now click ctrl + left click to go to definition and click ctrl + right click to return.