With diplomacy, volunteers to go to court (4)
I believe the answer is:
tact
'with diplomacy' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'volunteers to go to court' is the wordplay.
'volunteers' becomes 'TA' (abbreviation for Territorial Army).
'to go to' is a charade indicator (letters next to each other).
'court' becomes 'ct' (abbreviation used in road names).
'ta'+'ct'='TACT'
Can you help me to learn more?
(Other definitions for tact that I've seen before include "Consideration and sensitivity" , "Diplomatic sensitivity" , "Understanding" , "Skill in dealing with people" , "Delicacy of feeling, skill in saying the right thing" .)