Sensitivity, diplomacy (4)
I believe the answer is:
tact
I believe this clue is a double definition.
'sensitivity' is the first definition.
(being tactful is being sensitive)
'diplomacy' is the second definition.
(tact can mean diplomacy or sensitivity)
(Other definitions for tact that I've seen before include "Sensitivity in dealings" , "Delicacy of feeling, skill in saying the right thing" , "Sensitivity in dealing with people" , "Diplomatic sensitivity" , "Diplomacy or discretion" .)