Hello There,
Thanks for providing the information. You’re code is exactly correct. This will work in displaying excerpts like the blog index or archive layouts. Regretfully, The Grid plugin has its own code function that removes any html code present in the excerpt. What you have in mind like adding link in your excerpts may not be possible. We are afraid that we may not be able to assist you further since The grid is a 3rd party plugin. Though it is bundled in the theme, we are not familiar of the code and it requires further assistance from the creators of the plugin. And besides, this particular customization request is outside the scope of our support as this is not related to an issue with the theme or plugin and instead has to do with your customization of it. As such, you will need to investigate this particular issue on your own or seek help from a developer should you not feel comfortable making these changes yourself.
By the way, we’ve added this as a feature request so it can be taken into consideration for future development by the creators of The Grid plugin.
Thank you for your understanding.