### Clue: South-east Asian fellow's upset young Arab? (4)
### Answer: FOAL 
 ### Explanation: Definition: young Arab
  **Reversal of**(…'s upset, in a down clue) [LAO(one of the indigenous people of Laos, the South-East Asian nation) + F(abbrev. for "Fellow", especially a member of a learned society, as in "FRCS")].
Defn:  …, a four-legged mammal of a breed originating in Arabia.