Rabbit kin (4)
I believe the answer is:
hare
'rabbit kin' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hare that I've seen before include "'First catch your ....; then cook it'" , "Rabbit-like creature" , "As mad as this March animal" , "Old saying: 'Let the .... sit" , "Sort of rabbit" .)