Train former journalists (7)
I believe the answer is:
express
'train' is the definition.
(I've seen this before)
'former journalists' is the wordplay.
'former' becomes 'ex'.
'journalists' becomes 'press' (I've seen this before).
'ex'+'press'='EXPRESS'
(Other definitions for express that I've seen before include "Verbalise - very fast" , "Non-stop(ping)" , "Articulate, give voice to" , "Say; fast train" , "Quick -- exact" .)