It appears the Clutch Cover has popped loose. If the Clutch Cover is not damaged, then it may be possible to reseat it, but I'm not sure it can be done without removing the Display Assembly. Sometimes even with the Display Assembly removed it can be a little tricky reseating the Clutch Cover. Unless you are proficient with working on laptops, I would suggest taking the laptop to an Apple Store or an independent Apple Authorized Service Provider. If the Clutch Cover is damaged, then Apple or an AASP can replace just the Clutch Cover if it is a non-Retina model. If it is a Retina model, then an AASP may be able to acquire & install a used Clutch Cover.