Lease signatory (6)
I believe the answer is:
tenant
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lease signatory</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tenant that I've seen before include "one paying rent" , "Occupant of rented property" , "Lodger" , "he or she rents" , "his flat?" .)