Canine is nosy, regularly breaking into pigeon coop (6)
I believe the answer is:
coyote
'canine' is the definition.
(I know that coyote is a type of wolf)
'nosy regularly breaking into pigeon coop' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'breaking into' indicates putting letters inside.
'pigeon coop' becomes 'cote' (I've seen this in another clue).
The alternate letters of 'nosy' are 'oy'.
'oy' inserted within 'cote' is 'COYOTE'.
'is' is the link.
(Other definitions for coyote that I've seen before include "Small wild dog" , "American prairie dog" , "N. American wild dog" , "Confines" , "Wolf-like animal" .)