### Clue: Book senior hack and trendy medic into golf club (5,5)
### Answer: EDWIN DROOD 
 ### Explanation: Definition: Book
 ED(abbrev. for "editor"/a senior hack/journalist) **plus**(and) [IN(trendy/fashionable) + DR(abbrev. for "doctor"/a medic)] **contained in**(into) WOOD(a golf club with a head made of, used to be, wood, but now of other material too).
Defn: …/novel, The Mystery of Edwin Drood, to give it its full name, by Charles Dickens.