Land for nobleman by railway (7)
I believe the answer is:
country
'land' is the definition.
(I know that land can be written as country)
'nobleman by railway' is the wordplay.
'nobleman' becomes 'count' (count is a kind of nobleman).
'by' means one lot of letters go next to another.
'railway' becomes 'ry' (abbreviation for railway).
'count'+'ry'='COUNTRY'
'for' acts as a link.
(Other definitions for country that I've seen before include "See 9" , "land?" , "Nation" , "Rural" , "State; region" .)