Small summerhouse or pavilion (6)
I believe the answer is:
gazebo
I believe this is a double definition.
'small summerhouse' is the first definition.
(I've seen this before)
'pavilion' is the second definition.
(I know that gazebo is a type of pavilion)
(Other definitions for gazebo that I've seen before include "outhouse" , "Small summerhouse or open hut" , "Summerhouse - pavilion with view" , "Roofed structure in the garden" , "Garden viewpoint" .)