Incumbency (6)
I believe the answer is:
tenure
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">incumbency</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that incumbency can be written as tenure)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tenure that I've seen before include "Holding or property like tureen" , "Tenancy" , "Residence" , "The holding of office or land" , "Term of office" .)