### Clue: Island captured by ordinary chap is worth a chortle (6)
### Answer: JOCOSE 
 ### Explanation: Definition: worth a chortle
 COS(a Greek island in the Aegean Sea) **contained in**(captured by) JOE(N. American slang for an "ordinary chap"/a commonplace fellow).
Defn: …/eliciting a noisy gleeful laugh – a word coined by 22.