### Clue: Reddish-brown start to autumn, in two different ways (5)
### Answer: SEPIA 
 ### Explanation: Definition: Reddish-brown
 [SEP I](abbrev. for "September 1", with the Roman numeral substitution, regarded as the start to the autumn season) **plus**(…, in two different ways) **1st letter of**(start to) "autumn".