Acquaintance (7)
I believe the answer is:
contact
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">acquaintance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I have seen 'Useful acquaintance' mean 'contact' so perhaps 'acquaintance' could also mean 'contact')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for contact that I've seen before include "Maybe page" , "Close interaction" , "Useful acquaintance" , "Juxtaposition" , "Meeting" .)