### Clue: Rambling about new form of virus found in river (9)
### Answer: EXCURSIVE 
 ### Explanation: Definition: Rambling
  **Anagram of**(new form of) VIRUS **contained in**(found in) EXE(a river in England, the name derived from the Celtic word for – surprise! – "water"; and giving its name to towns like Exeter and Exmouth).
Answer: Descriptive of speech or thought that wanders,rambles round as if it were on an excursion.