Official opinion of the conga, perhaps? (5,4)
I believe the answer is:
party line
'official opinion' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'conga perhaps?' is the wordplay.
I cannot really understand how this works, but
'conga perhaps?' could be 'art' (conga is a kind of art) and 'art' is located in the answer.
This explanation may well be incorrect...
'of the' acts as a link.
Can you help me to learn more?
(Other definitions for party line that I've seen before include "politicians are expected to follow?" , "Political agenda" , "Official policy" , "more than one can call on" , "Political policy to which all must subscribe" .)