The Sahara, for example (6)
I believe the answer is:
desert
'the sahara for example' is the definition.
(sahara is a kind of desert)
This is the entire clue.
(Other definitions for desert that I've seen before include "ditch" , "Arid area of sand" , "Sahara or Gobi, say" , "Arid region with little or no vegetation" , "Abandon in barren terrain" .)