Changed course continually - sound diplomacy (6)
I believe the answer is:
tacked
'changed course' is the definition.
(as in changing tack)
'sound diplomacy' is the wordplay.
'sound' indicates a 'sounds like' (homophone) clue.
'diplomacy' becomes 'tact' (tact can mean diplomacy or sensitivity).
'tact' sounds like 'TACKED'.
'continually' is the link.
This may not be correct. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for tacked that I've seen before include "Sewed with loose temporary stitches" , "Sailed zig-zag course to use wind" , "Turned into the wind, as sailors do" , "Zig-zagged (in a sailing boat); fixed" , "Sailed zigzag course to take advantage of wind" .)