Large half-open building is a feature of garden (7)
I believe the answer is:
pergola
'feature of garden' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'large half-open building' is the wordplay.
'half' means to take half the letters.
'building' indicates an anagram.
'open' cut in half is 'op'.
'large'+'op'='largeop'
'largeop' with letters rearranged gives 'PERGOLA'.
'is a' is the link.
Can you help me to learn more?
(Other definitions for pergola that I've seen before include "Trellis for climbing plants" , "Structure for climbers" , "Arch for climbing plants" , "Bower" , "Lag rope (anag.)" .)