Bring into accord (6)
I believe the answer is:
attune
'bring into accord' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for attune that I've seen before include "Acclimatise" , "Harmonise or adapt, say mind to idea" , "Harmonize or adapt, to matter or idea" , "Harmonise or adapt to idea or music" , "Harmonise as with musical instrument" .)