Large house with good open area of land (6)
I believe the answer is:
grange
'large house' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'good open area of land' is the wordplay.
I cannot really understand how this works, but
'good' could be 'g' (abbreviation) and 'g' is located in the answer.
'area' could be 'range' (range is a kind of area) and 'range' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'with' is the link.
Can you help me to learn more?
(Other definitions for grange that I've seen before include "Ganger in country house with farm buildings" , "Farmhouse" , "US lodge" , "Country-house" , "Country house/farm" .)