Joining word (3)
I believe the answer is:
and
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">joining word</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 and that I've seen before include "Most-used conjunction in English" , "It's used to connect words, clauses or sentences" , "In addition" , "Also" , "Joiner or dandies" .)