Took in a note (3)
I believe the answer is:
ate
'took in' is the definition.
(I've seen this before)
'a note' is the wordplay.
'note' becomes 'te' (**).
'a'+'te'='ATE'
(Other definitions for ate that I've seen before include "Greek goddess of mischief" , "Devoured" , "Ingested" , "Took food" , "upset > Greek goddess" .)