### Clue: Wren at sea, say, one designing ships (5,9)
### Answer: NAVAL ARCHITECT 
 ### Explanation: Definition: one designing ships
 ARCHITECT(an example;say of which was Christopher Wren, famous for St. Paul's Cathedral and other London buildings) **placed after** NAVAL(adjective for being at sea). And of course, a Wren was a member of the British Women's Royal Naval Service.