Can get through to us from the zoo (7)
I believe the answer is:
toucans
'us from the zoo' is the definition.
Although both the answer and definition are plural nouns, I cannot see how one could define the other.
'can get through' is the wordplay.
'get' is an insertion indicator.
'through' becomes 'tous' (I can't justify this - if you can you should give a lot more credence to this answer).
'can' put into 'tous' is 'TOUCANS'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for toucans that I've seen before include "Flyers" , "Brilliantly coloured birds with very large beaks" , "they come with big bills" , "Brilliantly coloured birds of tropical America" .)