Elbowroom (6)
I believe the answer is:
leeway
'elbowroom' is the definition.
(I've seen this before)
This is the entire clue.
(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" .)