Roofed platform along the outside of a house (7)
I believe the answer is:
veranda
'roofed platform along the outside of a house' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for veranda that I've seen before include "Roofed terrace along the side of a house" , "Open roofed platform" , "balcony" , "Roofed platform along the outside of a house" , "Roofed platform adjoining a house" .)