Certain apartment (4)
(Other definitions for coop that I've seen before include "Cage for poultry" , "box of chickens" , "Store" , "pound" , "Pen" .)
'certain apartment' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for loft that I've seen before include "Backward slope in face of golf club" , "Room or space under a roof" , "Raised shelter for pigeons" , "Attic" , "Shelter for racing pigeons" .)