Resumption of harmonious relations (13)
I believe the answer is:
rapprochement
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">resumption of harmonious relations</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rapprochement that I've seen before include "resumption of friendly relations" , "Resumption of harmonious relations" , "Re-establishment of harmonious relations" , "Renewal of cordial relations" , "move towards peace?" .)