### Clue: First-year student swaps second for heart of princess, 28 (9)
### Answer: FRENCHMAN 
 ### Explanation: Definition: 28
  FRESHMAN(*first-year student*) with its S(*$$s$$econd*) replaced by(*swaps…for*) NC(*heart*,middle letters *of princess*).  Defn:  Description of *28*A BONAPARTE.