A teacher led exercise is more accuracy related; the teacher is facilitating the progresssion through the exercise.
Any exericse can be turned into a teacher-led exercise.
A good way to prepare your exercise goes:
- What is your exercise?
- What elements make up the exercise?
- How can you introduce a lead to the teacher in each element?
Check out the Accuracy/ Fluency Exercises document: http://bit.ly/2nGXYuv