Record held by piano teacher (4)
I believe the answer is:
note
I believe this is a double definition.
'record' is the first definition.
(note can mean to record or notate)
'held by piano teacher' is the second definition.
(I've seen this before)
(Other definitions for note that I've seen before include "Cash" , "Brief letter - distinction" , "Pay close attention to" , "Record; memo" , "Short message; tone" .)