Long-term occupation (6)
I believe the answer is:
career
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">long-term occupation</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 career that I've seen before include "Move headlong at high speed" , "Rush - occupation" , "Progresson through working life" , "Hurtle" , "Not intellectual" .)