Time-consuming business (7)
I believe the answer is:
palaver
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">time-consuming business</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 palaver that I've seen before include "Idle copious talk" , "idle conversation" , "Rabbit" , "Confused talk and activity" , "Rigmarole" .)