Agreement, concord (7)
I believe the answer is:
harmony
This clue is a double definition.
'agreement' is the first definition.
(I know that harmony is a type of agreement)
'concord' is the second definition.
(I know that concord can be written as harmony)
(Other definitions for harmony that I've seen before include "Mellifluous sound" , "Mutual rapport" , "Sweet or melodious sound, no disagreement" , "Accord" , "Agreement, concord" .)