Changed course due to report of diplomacy (6)
I believe the answer is:
tacked
'changed course' is the definition.
(I've seen this before)
'report of diplomacy' is the wordplay.
'report of' indicates a 'sounds like' (homophone) clue.
'diplomacy' becomes 'tact' (I've seen this before).
'tact' sounds like 'TACKED'.
'due to' is the link.
(Other definitions for tacked that I've seen before include "Changed course" , "Zig-zagged (in a sailing boat); fixed" , "Sailed zigzag course to take advantage of wind" , "Sailed zig-zag course to use wind" , "Turned into the wind, as sailors do" .)