It's sometimes said to be in motion (6)
I believe the answer is:
poetry
'be in motion' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'it's sometimes said' is the wordplay.
I cannot quite understand how this works, but
'said' could be 't' (I've seen this in other clues) and 't' is found within the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
The remaining letters 'pory' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for poetry that I've seen before include "Sonnets, limericks etc" , "Literary genre" , "Verse" , "Verses" , "Metrical writing" .)