Woman has no right on last available grassland (7)
I believe the answer is:
eleanor
'woman' is the definition.
'no right on last available grassland' is the wordplay.
'right' becomes 'R' (common abbreviation).
'on' is a charade indicator (letters next to each other).
'last' says to take the final letters.
'grassland' becomes 'lea' (lea is a kind of grassland).
The last letter of 'available' is 'e'.
'no'+'r'='nor'
'e'+'lea'='elea'
'nor' put after 'elea' is 'ELEANOR'.
'has' acts as a link.
(Other definitions for eleanor that I've seen before include "Wife of F. D. Roosevelt" , "- of Aquitaine, - of Castile (queens)" , "girl" , "Queen from Aquitaine" , "Franklin D. Roosevelt's wife" .)