It gets quieter for wild dogs (7)
I believe the answer is:
dingoes
'for wild dogs' is the definition.
(dingo is a kind of wild dog)
'it gets' is the wordplay.
'it' becomes 'din' (I am not sure about this - if you are sure you should believe this answer much more).
'gets' becomes 'goes' ('go' can be a synonym of 'get').
'din'+'goes'='DINGOES'
'quieter' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for dingoes that I've seen before include "Wild dogs of Australia" , "Australian pack" , "Australian wild dogs" , "Canine predators" , "Cairns must live with these dogs" .)