Iran ends with diplomacy undamaged (6)
I believe the answer is:
intact
'undamaged' is the definition.
(thesaurus)
'iran ends with diplomacy' is the wordplay.
'ends' says to hollow out the word (remove centre letters).
'with' means one lot of letters go next to another.
'diplomacy' becomes 'tact' (I've seen this before).
'iran' with its centre taken out is 'in'.
'in'+'tact'='INTACT'
(Other definitions for intact that I've seen before include "Whole and undamaged" , "Not broken or damaged" , "Unbroken - sound" , "Entire, undamaged" , "Undiminished" .)