Good scope for farmhouse (6)
I believe the answer is:
grange
'farmhouse' is the definition.
(I've seen this before)
'good scope' is the wordplay.
'good' becomes 'g' (abbreviation).
'scope' becomes 'range' ('range' can be a synonym of 'scope').
'g'+'range'='GRANGE'
'for' is the link.
(Other definitions for grange that I've seen before include "Country house/farm" , "Country house and surrounding buildings" , "farming complex" , "old dwelling" , "Country-house" .)