Bit of dialogue (4)
I believe the answer is:
line
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bit of dialogue</span>' is the definition.<br/ ><span class="explanation-format__explanation">(eg a line of dialogue in a play)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for line that I've seen before include "job" , "Some poetic feet; boundary, when drawn" , "A length without breadth or thickness" , "Long narrow mark" , "Row; track" .)