### Clue: Debt compiler has for Listener's ace, one of fifty (4)
### Answer: IOWA 
 ### Explanation: Definition: one of fifty
 **Homophone of**(… for Listener) "I owe"(compiler/setter of this crossword, using the self-referential pronoun, acknowledging that he has a debt) + A(abbrev. for "ace", the playing card with one pip).
Defn: …, the number of states in the US.