Impediment (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impediment</span>' is the definition.<br/ ><span class="explanation-format__explanation">('let' could historically mean a hindrance)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for let that I've seen before include "Permitted" , "Permit; lease" , "Allow the obstruction" , "Award (a contract)" , "Disappoint or fail to support - ... down" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impediment</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that impediment can be written as hindrance)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hindrance that I've seen before include "Delay to overcome" , "barrier" , "Nicer hand (anag.)" , "Something inhibiting action" , "Impediment" .)