Sufficient space to move freely (9)
(Other definitions for elbow room that I've seen before include "find adequate space to work in" , "play" , "Space for manoeuvre" , "adequate working area" , "Freedom to move" .)
(Other definitions for elbowroom that I've seen before include "Space to function" , "Bowl Romeo out to get some space" , "Leeway" , "Lower boom to make working space" , "Enough scope to function" .)