Turn one's back on Sahara? (6)

I believe the answer is:

desert

I believe this is a double definition.

'turn one's back on' is the first definition.

'sahara?' is the second definition.
(sahara is a kind of desert)

(Other definitions for desert that I've seen before include "Abandon in barren terrain" , "merit and a > quiet place" , "Kalahari, e.g." , "Callously abandon" , "sands" .)

I've seen this clue in The Sun.

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