Linked series (5)
I believe the answer is:
chain
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">linked series</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 chain that I've seen before include "Series of interconnecting links" , "distance for a run?" , "A measure" , "Mountain range" , "series of hotels" .)