Seldom will it stop to put thought into words (7)
I believe the answer is:
express
This clue might be a double definition.
'seldom will' is the first definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'it stop to put thought into words' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for express that I've seen before include "air" , "Utter; speedy" , "Put into words - fast" , "Verbalize" , "Non-stop(ping)" .)