### Clue: This with dud ha-has ruins hare and hounds – race discontinued (5)
### Answer: RONNE 
 ### Explanation: Definition: race discontinued
A composite anagram – (RONNE DUD HAHAS)* = HARE AND HOUNDS. This word – an old form of "run" – felt familiar, and indeed it appeared (with a different clue, of course) in Azed 2393