I am on at journalist about it being copied (8)
I believe the answer is:
imitated
'being copied' is the definition.
(I've seen this before)
'i am on at journalist about it' is the wordplay.
'i am' becomes 'I'm' (contraction).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'journalist' becomes 'ed' (short for editor).
'about' says to put letters next to each other.
'at'+'ed'='ated'
'ated' after 'it' is 'itated'.
'im'+'itated' is 'IMITATED'.
(Other definitions for imitated that I've seen before include "most sincerely flattered?" , "Copied, simulated" , "Aped, copied" , "Took off" , "Followed" .)