Copies of the City shoe design (6)
I believe the answer is:
echoes
'copies' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Perhaps there's an association between them I don't understand?
'city shoe design' is the wordplay.
'city' becomes 'EC' (the City of London postcode).
'design' is an anagram indicator.
'shoe' anagrammed gives 'hoes'.
'ec'+'hoes'='ECHOES'
'of the' acts as a link.
Can you help me to learn more?
(Other definitions for echoes that I've seen before include "Repeats" , "Resounds, reverberates" , "Reflections of sound waves" , "Natural sound reflections" , "Sounds heard again" .)