Thread; sequence (6)
I believe the answer is:
string
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">thread</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that thread can be written as string)</span><br/ ><br/ >'<span class="explanation-format__original">sequence</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that string is a type of sequence)</span><br/ ><br/ ></span>
(Other definitions for string that I've seen before include "It's difficult to say how long a piece of it is" , "How long could a piece of it be?" , "Something for tying up" , "Hard to say how long a piece of it is" , "groups of horses" .)