### Clue: Red, indigo's second, then brown one, perhaps? (8,6)
### Answer: CARDINAL NUMBER 
 ### Explanation: Definition: one, perhaps
 CARDINAL(a deep red;scarlet) + **the 2nd letter of**(…'s second) "indigo" **plus**(then) UMBER(a brown colour).
Defn: An example of which;perhaps, is "1". Well constructed clue, with 3 colours mentioned.