Height of land round ancient city (7)
I believe the answer is:
stature
'height' is the definition.
(I know that height can be written as stature)
'land round ancient city' is the wordplay.
'land' becomes 'state' (synonyms).
'round' is an insertion indicator.
'ancient city' becomes 'ur' (ancient Sumerian city state).
'state' enclosing 'ur' is 'STATURE'.
'of' is the link.
(Other definitions for stature that I've seen before include "Consequence" , "Height; importance" , "level of achievement" , "Importance, reputation" , "Height; eminence" .)