Report completed in lock-up (8)
I believe the answer is:
coverage
'report' 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 don't see?
'completed in lock-up' is the wordplay.
'completed' becomes 'over' (synonyms).
'in' means one lot of letters goes inside another.
'lock up' becomes 'cage' (I've seen this in another clue).
'over' put into 'cage' is 'COVERAGE'.
Can you help me to learn more?
(Other definitions for coverage that I've seen before include "Treatment (of an issue) by the media" , "news attention" , "publicity" , "Extent reached by advertising" , "Press reporting" .)