### Clue: Ridin' on island in the Pacific (6)
### Answer: BIKINI 
 ### Explanation: Definition: in the Pacific
  BIKIN'(shortened form of biking,riding, a literary device mostly used in order to provide a rhyme) **placed before**(on, in a down clue) I($$i$$sland)
Defn:  The atoll in the Pacific Ocean, former site of nuclear bomb tests