Detecting value changes in a timeline behaviour & Auto clip renaming

I've got an enum variable in a playable behaviour script:

Code (CSharp):

1. [Serializable]
2. public class CharacterDriverBehaviour : PlayableBehaviour
3. {
4.    public CharacterAction Action;
5. }

Where CharacterAction is an Enum. Using the playables wizard, I generated a property drawer for all of this, and the enum is drawn with a dropdown in the inspector.

I want to rename my clip to be equal to the value of the enum, so I need to know how to:

1. Detect when the value has changed
2. Set the clip name

I believe for #2, the display name has to be set through the track using the displayName field, however I don't see this displayName in the manual for TimelineClip although visual studio can find it.