1) Adequate maneuvering space 2) Ample room 3) Ample scope 4) Claustrophobe comforter 5) Free scope 6) Free space 7) Leeway 8) Operating space 9) Scope 10) Space in which to move freely 11) Space to maneuver 12) Sufficient space Found on https://www.crosswordclues.com/clue/elbowroom
El'bow·room` noun Room to extend the elbows on each side; ample room for motion or action; free scope. 'My soul hath elbowroom .' Shak. « Then came a stretch of grass and a little more elbowroom .» W. G. Norris. Found on http://www.encyclo.co.uk/webster/E/16