Abandon; arid area (6)
I believe the answer is:
desert
I believe this clue is a double definition.
'abandon' is the first definition.
(synonyms)
'arid area' is the second definition.
(I've seen this in another clue)
(Other definitions for desert that I've seen before include "Eg, the Sahara" , "Sahara, Gobi, etc" , "merit and a > quiet place" , "Leave behind - waste" , "Sahara or Gobi, say" .)