Muddy lakes and earth around dry part of Botswana (8,6)
I believe the answer is:
kalahari desert
'part of botswana' is the definition.
('Kalahari Desert' is part of 'botswana')
'muddy lakes and earth around dry' is the wordplay.
I cannot really understand how this works, but
'earth' could be 'e' and 'e' is found in the answer.
'dry' could be 'arid' (similar in meaning) and 'arid' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for kalahari desert that I've seen before include "Arid region of southern Africa" , "great waste" , "Semi-arid area of southern Africa" , "arid plateau" , "Arid region in south-west Africa" .)