Hello Pedro,
You might be able to do this by using Web Screen Painter and making a Form Group with Description as "Read Only" for your Analysts.
And another Form Group for your super-analysts who need to edit this field.
However, I would caution that perhaps training is a better approach here. Locking your Analysts out of being able to Edit the Description field would remove a lot of their autonomy. It is the type of function that an Analyst typically would need to be effective.
If it is a case of just maintaining an audit record, then the Description field is tracked by default by a "Field Update."
Every time the Description is changed,the old and new values are recorded in the Activity Log.
Thanks, Kyle_R.