Old boat The Beagle could make this sound (4)
I believe the answer is:
bark
I believe this clue is a double definition.
'old boat' is the first definition.
(archaic term for boat)
'beagle could make this sound' is the second definition.
(beagle is a breed of dog)
'the' is the link.
(Other definitions for bark that I've seen before include "Dog's sound" , "Protective covering of woody stems" , "give sharp cry" , "craft" , "Yap" .)