Breed of dog that will change some day (7)
I believe the answer is:
samoyed
'breed of dog' is the definition.
(I've seen this before)
'change some day' is the wordplay.
'change' indicates an anagram.
'some'+'day'='someday'
'someday' is an anagram of 'SAMOYED'.
'that will' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for samoyed that I've seen before include "Siberian dog" , "Breed of white dog from Siberia - May's ode (anag)" , "one barking" , "Dog - someday (anag)" , "Dog similar to chow" .)