### Clue: It's found on board galley the last two across the sea to France (5)
### Answer: EMERY 
 ### Explanation: Definition: It's found on board
 **The last 2 letters of**(…: the last two) "galley" **containing**(across) MER("sea" to those in France).
Defn: The granular mineral substance on a board, used in manicuring.