### Clue: Fictional account of river area around Kent (9)
### Answer: FALSEHOOD 
 ### Explanation: Definition: Fictional account
 [ FAL(the river flowing through Cornwall, England) + 'HOOD(short for "neighbourhood";the area around one) ] **containing**(around) S.E.(abbrev. for South East England, including Kent).
Defn: … aka a "lie".