Watch black duck in summerhouse (6)
I believe the answer is:
gazebo
'summerhouse' is the definition.
(I know that summerhouse can be written as gazebo)
'watch black duck' is the wordplay.
'watch' becomes 'gaze' (I can't justify this - if you can you should give a lot more credence to this answer).
'black' becomes 'b' (as in pencil classifications).
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'gaze'+'b'+'o'='GAZEBO'
'in' is the link.
Can you help me to learn more?
(Other definitions for gazebo that I've seen before include "Kind of garden summerhouse with wide view" , "Garden sumer-house with wide view" , "Summerhouse with a good view" , "Roofed structure in the garden" , "garden feature" .)