### Clue: Fedora is this  kind of hat (5)
### Answer: OPERA 
 ### Explanation: Definition: Fedora is this ,kind of hat
 Double defn: 1st: The opera by Umberto Giordano; and 2nd: A kind of hat conveniently collapsible for keeping in opera house cloakrooms, of course. Lovely surface, as a fedora is a kind of hat, too.