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As in the desert, you get one free (4)

Ross

I believe the answer is:

arid

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'as in the desert you' is the definition.
I can't judge whether this defines the answer.

'get one free' is the wordplay.
'get' means one lot of letters go next to another.
'one' becomes 'a' (**).
'free' becomes 'rid' ('rid' can be a synonym of 'free').
'a' next to 'rid' is 'ARID'.

Can you help me to learn more?

(Other definitions for arid that I've seen before include "Dry and unfertile" , "Dry and infertile" , "Dry raid" , "Desiccated" , "Extremely dry" .)

I've seen this clue in the Evening Standard.
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