Key often used by news boss went in (7)
I believe the answer is:
entered
'went in' is the definition.
('enter' can be a synonym of 'go in')
'key often used by news boss' is the wordplay.
'key often used' becomes 'enter' (computer keyboard key).
'by' means one lot of letters go next to another.
'news boss' becomes 'ed' (I've seen this in other clues).
'enter'+'ed'='ENTERED'
(Other definitions for entered that I've seen before include "Enrolled or went in" , "Logged; arrived" , "Went in and registered as competitor" , "Came in; recorded" , "Ten deer (anag) - went in" .)