Person from the Middle East (4)
'person from the middle east' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for arab that I've seen before include "One from the Middle East or North Africa" , "Saudi or Omani, perhaps" , "Semite" , "Saudi, e.g." , "Saudi, perhaps - breed of horse" .)
(Other definitions for qatari that I've seen before include "Gulf State native" , "National" , "Gulf emirate native" , "One from Doha, say" .)