Endless dirt: it is recurrent, creating baffling problems (6)
I believe the answer is:
cruxes
'baffling problems' is the definition.
The answer and definition 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?
'endless dirt it is recurrent' is the wordplay.
'endless dirt' becomes 'cru' (I am not sure about this - if you are sure you should believe this answer much more).
'it' becomes 'sex' ('it' is a common euphemism for sex).
'is recurrent' shows that the letters should be reversed in order (recurrent can mean turning back).
'sex' written backwards gives 'xes'.
'cru'+'xes'='CRUXES'
'creating' acts as a link.
Can you help me to learn more?
(Another definition for cruxes that I've seen is " Vital parts of problems, decisive points".)