Regimentation Australians may enjoy (5)
I believe the answer is:
rules
'regimentation australians' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Maybe you can see a link between them that I don't see?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for rules that I've seen before include "strips" , "Is king" , "In Australia, football" , "controls" , "Laws; draws lines" .)