Blokes confined by very big threats (5)
I believe the answer is:
omens
'threats' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe they are linked in a way I don't understand?
'blokes confined by very big' is the wordplay.
'blokes' becomes 'men' (bloke can informally mean a man).
'confined by' is an insertion indicator.
'very big' becomes 'os' (abbreviation for outsize).
'men' put into 'os' is 'OMENS'.
Can you help me to learn more?
(Other definitions for omens that I've seen before include "Signs or warnings for the future" , "Portents, prophetic signs" , "Prognostications" , "Augurs" , "Auguries" .)