Elbowroom (6)
I believe the answer is:
leeway
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">elbowroom</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 leeway that I've seen before include "Scope for freedom of movement or action" , "play" , "Margin of tolerance" , "Room to manoeuvre, latitude" , "Margin allowing room for manoeuvre" .)