Audibly changed direction in diplomacy (4)
I believe the answer is:
tact
'diplomacy' is the definition.
(tact can mean diplomacy or sensitivity)
'audibly changed direction' is the wordplay.
'audibly' shows a homophone (sound like).
'changed direction' becomes 'tacked' (tack can mean to change direction when sailing).
'tacked' is a homophone of 'TACT'.
'in' acts as a link.
(Other definitions for tact that I've seen before include "Sensitivity in dealings" , "Diplomatic sensitivity" , "Sensitivity in dealing with people" , "Diplomacy or discretion" , "Diplomatic skill" .)