What does ^over a musical note mean, please?

[seeker]

Just that really! Thank you!

It means to accent the note.

Thank you. I will tell the clarinet practiser!

Ah! I play the clarinet too.

Just so that you can picture the scene. Dd is playing "God Bless the Child" with one of the cheesiest accompaniments I have ever heard on a CD. Her little brother is providing an occasional obbligato on a harmonica!