Leave barren terrain (6)

I believe the answer is:

desert

This clue is a double definition.

'leave' is the first definition.
(desert can mean to leave or abandon)

'barren terrain' is the second definition.
(a desert is barren land)

(Other definitions for desert that I've seen before include "Abandon; barren waste" , "Run away (from army)" , "infertile land" , "Abandon; dull area" , "See 1" .)

I've seen this clue in The Times.

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