Not sure but that could be normal clutch clunking, unless this is something new that just started , most will clunk from clutch engagment and as normal clutch wear takes place it will clunk a bit. If the shifter is setting it the slot and no gear grinding is taking place 10 to 1 it's the clutch. could even be from an old belt , I have almost 4K on my 2011 and the clutch will clunk at engagment for sure , still running factory belt as well.
Hope this helps