Details on glasses are unfinished? (4)
I believe the answer is:
spec
'details' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?
'glasses are unfinished?' is the wordplay.
'glasses' becomes 'specs' (spectacles).
'are unfinished?' means to remove the last letter.
'specs' with its last letter taken away is 'SPEC'.
'on' is the link.
Can you help me to learn more?
(Other definitions for spec that I've seen before include "commercial venture" , "Instructions" , "On - means without a plan but with hope of success" , "Detailed design (colloq.)" , "Detailed design document (abbr.)" .)