Insisted on reporters joining journalist (7)
I believe the answer is:
pressed
'insisted' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Maybe they are linked in a way I don't understand?
'reporters joining journalist' is the wordplay.
'reporters' becomes 'press' (newspaper reporters).
'joining' is a charade indicator (letters next to each other).
'journalist' becomes 'ed' (short for editor).
'press'+'ed'='PRESSED'
'on' acts as a link.
Can you help me to learn more?
(Other definitions for pressed that I've seen before include "Argued strongly and exerted force" , "under some strain" , "Urged U crushed" , "in a big hurry" , "Coerced" .)