The end of certain rabbits (4)
I believe the answer is:
This clue could be a double definition.
'the end' is the first definition.
(tail is a kind of end)
'of certain rabbits' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for tail that I've seen before include "Elongated posterior part of an animal" , "Follow -- rear end" , "Dog - end" , "Follow furtively like private detective" , "private eye" .)