goto-sublime

Linux - create "Default (Linux).sublime-mousemap" in ~/.config/sublime-text-3/Packages/User
Mac - create "Default (OSX).sublime-mousemap" in ~/Library/Application Support/Sublime Text 3/Packages/User
Win - create "Default (Windows).sublime-mousemap" in %appdata%\Sublime Text 3\Packages\User

[
    {
        "button": "button1", 
        "count": 1, 
        "modifiers": ["super"],
        "press_command": "drag_select",
        "command": "goto_definition"
    }
]