What can be found in unwise new version (6)
I believe the answer is:
rehash
'new version' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'what can be found in unwise' is the wordplay.
I cannot really see how this works, but
'what' could be 'eh' (sound used to ask 'what?' or 'pardon?') and 'eh' is located in the answer.
'unwise' could be 'rash' and 'rash' is found in the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for rehash that I've seen before include "Put old material into new form without much change" , "Serve up old ideas" , "Re-use old material with little or no change" , "Same material, different mix" , "Reworking of old material" .)