Man with an unusually arid place in Egypt (10)
I believe the answer is:
alexandria
'in egypt' is the definition.
('Alexandria' is part of 'egypt')
'man with an unusually arid' is the wordplay.
'man' becomes 'alex' ().
'with' indicates putting letters inside.
'unusually' is an anagram indicator.
'arid' with letters rearranged gives 'dria'.
'an' inserted inside 'dria' is 'andria'.
'alex'+'andria'='ALEXANDRIA'
'place' is the link.
(Other definitions for alexandria that I've seen before include "Chief port of Egypt" , "Egyptian Mediterranean port" , "Egyptian city" .)