It becomes more peaceful for wild animals (7)
I believe the answer is:
dingoes
'peaceful for wild animals' is the definition.
I can't judge whether this defines the answer.
'it becomes more' is the wordplay.
'it' becomes 'din' (I can't explain this - if you can you should give a lot more credence to this answer).
'becomes' becomes 'goes' ('go' can be a synonym of 'become').
'more' means one lot of letters go next to another (some letters added to the previous ones).
'din'+'goes'='DINGOES'
Can you help me to learn more?
(Other definitions for dingoes that I've seen before include "Australian pack" , "Australian wild dogs" , "Cairns must live with these dogs" , "Wild dogs of Australia" , "Canine predators" .)