Long-eared hound (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
beagle
(Other definitions for beagle that I've seen before include "Small, sturdy breed of hound" , "HMS - was Darwin's ship; hunting dog" , "Darwin voyaged in this ship" , "Short-haired dog" , "Hunting hound" .)