Close acquaintance (6)
I believe the answer is:
friend
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">close acquaintance</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 friend that I've seen before include "Person regarded with trust and affection" , "One in need is one indeed" , "Organisation's supporter" , "Buddy, mate" , "China" .)