Diplomatic in court dividing fault roughly (7)
I believe the answer is:
tactful
'diplomatic' is the definition.
('tactful' can be similar in meaning to 'diplomatic')
'court dividing fault roughly' is the wordplay.
'court' becomes 'ct'.
'dividing' means one lot of letters goes inside another.
'roughly' indicates an anagram.
'fault' is an anagram of 'taful'.
'ct' going into 'taful' is 'TACTFUL'.
'in' is the link.
(Other definitions for tactful that I've seen before include "Polite" , "Sensitive to others on difficult issues" , "Sensitive to others' feelings" , "Like diplomat" , "Considerate for other's feelings" .)