Time to do something in diplomacy (4)
I believe the answer is:
tact
'diplomacy' is the definition.
(tact can mean diplomacy or sensitivity)
'time to do something' is the wordplay.
'time' becomes 't' (abbreviation).
'to' means one lot of letters go next to another.
'do something' becomes 'act' (I've seen this before).
't'+'act'='TACT'
'in' is the link.
(Other definitions for tact that I've seen before include "Fine perception" , "measure of diplomacy?" , "Delicacy of feeling, skill in saying the right thing" , "Consideration and sensitivity" , "Sensitivity, diplomacy" .)