Mix socially (9)
There are a few possibilities for this:
associate
(Other definitions for associate that I've seen before include "Get together with" , "Make a logical or casual connection" , "Not having full status" , "Join" , "Connect; partner" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mix socially</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hobnob that I've seen before include "Associate on familiar terms" , "Associate familiarly" , "make light conversation" , "Hang out with people of standing" , "Spend time together, socialise" .)
(Other definitions for mingle that I've seen before include "Mix - associate" , "Join the crowd, mix in" , "Mix among others" , "Blend" , "Mix together" .)