Ripe for development around dry open grassland (7)
I believe the answer is:
prairie
'open grassland' is the definition.
(I've seen this before)
'ripe for development around dry' is the wordplay.
'for development' indicates an anagram.
'around' means one lot of letters goes inside another.
'dry' becomes 'air' (airing is a kind of drying).
'ripe' is an anagram of 'prie'.
'prie' going around 'air' is 'PRAIRIE'.
(Other definitions for prairie that I've seen before include "Cowboy song: ` `Bury me not on the lone .......' '" , "Extensive US grassland" , "Open grassland of North America" , "Barren plain" , "-- Dog; -- oyster" .)